Pregnancy Calculator
NewTrack your pregnancy journey week by week. Calculate due date, monitor baby's development, get personalized health insights for mother and baby, and prepare for childbirth.
Pregnancy Calculator
Due Date & Trimester TrackerTrack your pregnancy journey week by week, get personalized insights for mother and baby
40-Week Journey
A full-term pregnancy is 40 weeks (280 days) from the first day of your last period. Only 5% of babies arrive on their exact due date – it's completely normal to deliver between 37-42 weeks.
Three Trimesters
First trimester (weeks 1-13): Organ formation. Second trimester (14-27): Rapid growth. Third trimester (28-40): Final development and preparation for birth.
Baby's Development
By week 6, the heart begins beating. By week 12, all major organs have formed. By week 24, baby is viable outside the womb with medical support.
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Important Medical Disclaimer
This calculator provides estimates for educational purposes based on standard medical formulas (Naegele's Rule). Every pregnancy is unique, and due dates are estimates – only 5% of babies arrive on their exact due date.
This tool is not a substitute for professional medical advice, diagnosis, or treatment. Always consult with your healthcare provider for personalized pregnancy care, especially if you experience any warning signs such as severe pain, bleeding, or decreased fetal movement.
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Complete Guide to Pregnancy: Week by Week Development, Health Tips & Preparation
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Understanding Pregnancy: Your 40-Week Journey to Motherhood
Welcome to Your Pregnancy Journey
A typical pregnancy lasts about 40 weeks, counted from the first day of your last menstrual period (LMP).
Pregnancy is divided into three trimesters, each with distinct developmental milestones for your baby and changes for your body. Understanding what to expect each week helps you prepare for a healthy pregnancy and delivery.
First Trimester (Weeks 1-13)
Organ formation, highest risk period, common symptoms: morning sickness, fatigue, breast tenderness
Baby size by week 13: ~3 inches, weight ~1 oz
Second Trimester (Weeks 14-27)
Rapid growth, anatomy scan, feeling movement, energy returns, baby bump shows
Baby size by week 27: ~14 inches, weight ~2 lbs
Third Trimester (Weeks 28-40)
Final growth, lung maturation, baby drops into position, preparing for birth
Baby size at birth: 18-22 inches, 6-9 lbs
Did you know? Only about 5% of babies arrive on their exact due date. Full term is considered 37 to 42 weeks. Use our pregnancy calculator above to estimate your due date based on your last period or conception date.
How Is My Due Date Calculated? 4 Common Methods
Naegele's Rule
LMP + 280 days
Most common method for women with regular 28-day cycles
Accuracy: ± 7-10 days
Conception Date
Conception + 266 days
If you know exact conception date (ovulation tracking)
Accuracy: ± 3-5 days
Ultrasound Dating
First trimester measurements
Most accurate at 8-12 weeks based on baby's size
Accuracy: ± 5-7 days
IVF Transfer
Transfer + 266 days - embryo age
For IVF pregnancies with known transfer date
Accuracy: ± 1-2 days
Important to know: Your due date is an estimate – only 5% of babies arrive exactly on their due date. Healthcare providers consider pregnancies full term between 37 weeks and 42 weeks. Our pregnancy calculator uses Naegele's rule, the standard method used by most doctors.
First Trimester (Weeks 1-13): What to Expect
Baby's Development
- 1Week 4: Implantation complete – pregnancy hormone hCG rises
- 2Week 5-6: Baby's heart begins beating – may be seen on early ultrasound
- 3Week 8: All major organs are forming – baby now called a fetus
- 4Week 10: Fingernails, toenails forming – baby can move though you can't feel it
- 5Week 12: Reflexes appear – baby can open and close fingers
Size at 13 weeks: 2-3 inches long, weight about 1 ounce (size of a peach)
Mom's Body & Symptoms
- Morning sickness: Nausea can occur any time of day, peaks around week 9
- Fatigue: Extreme tiredness due to rising progesterone
- Breast changes: Tenderness, darkening areolas, veins more visible
- Frequent urination: Growing uterus presses on bladder
- Food aversions/cravings: Hormones affect taste and smell
- Mood swings: Hormonal changes affect emotions
First Trimester To-Do List:
- ✓ Schedule first prenatal visit (8-10 weeks)
- ✓ Start prenatal vitamins with folic acid
- ✓ Stop alcohol, smoking, limit caffeine
- ✓ Discuss medications with your doctor
Second Trimester (Weeks 14-27): The "Golden Period"
Baby's Development
- 1Week 14-15: Baby makes facial expressions, sucks thumb
- 2Week 16-20: First movements felt (quickening) – like flutters or bubbles
- 3Week 18-22: Anatomy scan ultrasound checks all organs, can learn gender
- 4Week 20: Halfway point! Baby can hear your voice
- 5Week 24: Baby viable outside womb with medical help
- 6Week 27: Eyes open, sleeps and wakes regularly
Size at 27 weeks: 13-15 inches long, weight about 2 pounds (size of a head of cauliflower)
Mom's Body & Symptoms
- Energy returns: Nausea usually subsides, fatigue improves
- Baby bump shows: Uterus expands above pubic bone
- Skin changes: Linea nigra (dark line on belly), stretch marks may appear
- Round ligament pain: Sharp twinges on side of belly
- Increased appetite: Need about 340 extra calories daily
- Braxton Hicks: Practice contractions may begin
Second Trimester To-Do List:
- ✓ Schedule anatomy scan (18-22 weeks)
- ✓ Take glucose screening test (24-28 weeks)
- ✓ Start childbirth classes
- ✓ Register for baby shower
- ✓ Begin nursery planning
Third Trimester (Weeks 28-40): The Home Stretch
Baby's Development
- 1Week 28: Brain rapidly developing, baby dreams during REM sleep
- 2Week 30: Baby can distinguish light from dark
- 3Week 32: Practice breathing movements, bones harden
- 4Week 34-35: Baby settles into head-down position for birth
- 5Week 36: Lungs maturing, baby gains about 1/2 pound per week
- 6Week 37: Full term! Baby considered early term if born now
- 7Week 40: Due date – baby ready for birth!
Size at birth: 18-22 inches long, weight 6-9 pounds (size of a watermelon)
Mom's Body & Symptoms
- Shortness of breath: Uterus presses on diaphragm
- Frequent urination: Baby's head presses on bladder
- Swelling (edema): Ankles, feet, hands may swell
- Back pain: Extra weight strains lower back
- Heartburn: Hormones relax esophageal sphincter
- Insomnia: Hard to get comfortable, frequent bathroom trips
- Lightening: Baby drops into pelvis (weeks before labor)
Third Trimester To-Do List:
- ✓ Group B strep test (35-37 weeks)
- ✓ Pack hospital bag (by week 36)
- ✓ Install car seat correctly
- ✓ Finalize birth plan
- ✓ Arrange maternity leave
- ✓ Prepare siblings/pets for new baby
Nutrition During Pregnancy: What to Eat for a Healthy Baby
First Trimester
Calories: No extra needed – quality over quantity
Key Nutrients:
- Folic Acid (400-800 mcg) – prevents neural tube defects
- Iron (27 mg) – supports blood supply
- Vitamin B6 (1.9 mg) – helps with nausea
Second Trimester
Calories: +340 extra calories per day
Key Nutrients:
- Calcium (1000-1300 mg) – builds baby's bones
- Vitamin D (600 IU) – helps calcium absorption
- Omega-3 DHA (200-300 mg) – brain development
Third Trimester
Calories: +450 extra calories per day
Key Nutrients:
- Protein (71-100 g) – fetal growth
- Iron (27 mg) – prevent anemia
- Fiber (28-30 g) – prevent constipation
Foods to Avoid During Pregnancy
- •Alcohol – no safe amount known
- •Raw fish (sushi, sashimi)
- •Unpasteurized dairy (soft cheeses)
- •Deli meats (unless heated to steaming)
- •High-mercury fish (shark, swordfish, king mackerel)
- •Raw/undercooked eggs
- •Excess caffeine (limit to 200mg/day – about 1-2 cups coffee)
Safe Exercise During Pregnancy: Stay Active, Stay Healthy
First Trimester
Walking, swimming, prenatal yoga, light strength training
Avoid overheating, stay well-hydrated
Second Trimester
Walking, swimming, prenatal Pilates, stationary cycling
Avoid lying flat on back after 16 weeks
Third Trimester
Walking, swimming, prenatal yoga, Kegel exercises
Avoid heavy lifting, don't overexert, balance focus
General guidelines: Aim for 150 minutes of moderate exercise per week. Listen to your body – if something hurts, stop. Always consult your healthcare provider before starting or continuing any exercise program during pregnancy.
Warning Signs: When to Call Your Doctor Immediately
Seek Immediate Care
- •Vaginal bleeding – especially if heavy or with cramping
- •Severe abdominal pain or cramping that doesn't go away
- •Water breaking – gush or continuous leak of fluid
- •Severe headache not relieved by Tylenol
- •Vision changes – blurring, flashing lights, spots
- •Severe swelling of face, hands, or feet (sudden)
- •Difficulty breathing or chest pain
Call Within 24 Hours
- •Fever over 100.4°F (38°C)
- •Decreased fetal movement – less than 10 kicks in 2 hours after 28 weeks
- •Painful urination or burning
- •Regular contractions before 37 weeks (preterm labor signs)
- •Vomiting that prevents keeping fluids down
Prenatal Tests & Screenings: What to Expect When
| Test | Timing | Purpose |
|---|---|---|
| Pregnancy Test (hCG) | After missed period | Confirm pregnancy |
| First Trimester Screening | 11-14 weeks | Nuchal translucency ultrasound + blood tests for chromosomal abnormalities |
| Cell-Free DNA Testing (NIPT) | 10+ weeks | Screens for Down syndrome, trisomy 18/13, can detect gender |
| Anatomy Scan | 18-22 weeks | Detailed ultrasound of baby's organs, limbs, spine, can learn gender |
| Glucose Screening | 24-28 weeks | Check for gestational diabetes |
| Rh Factor Antibody Screen | First visit, 28 weeks | Check blood type and Rh compatibility |
| Group B Strep | 35-37 weeks | Screen for bacteria that can affect newborn during birth |
Newborn Care Basics: What You Need to Know
Feeding
Breastfeed 8-12 times per day or formula every 2-3 hours. Watch for hunger cues (rooting, sucking on hands).
Diapering
8-10 wet diapers/day after first week. Newborns poop several times daily – varies by feeding method.
Sleep
14-17 hours/day, always place baby on back in crib with no loose bedding. Never co-sleep in adult bed.
Bathing
Sponge bath until umbilical cord falls off (1-3 weeks). Then 2-3 times/week in small tub.
Temperature
Normal 97.5-99.5°F. Dress in one more layer than you're wearing. Never over-bundle.
Umbilical Cord
Keep dry and clean, fold diaper below it. Falls off naturally in 1-3 weeks.
Postpartum Recovery Timeline: What's Normal After Birth
Remember: Every woman's recovery is different. If you experience severe pain, heavy bleeding, fever, or symptoms of postpartum depression (overwhelming sadness, anxiety, trouble bonding), contact your healthcare provider immediately.
Birth Plan Checklist: Prepare for Labor & Delivery
20By Week 20
- Choose healthcare provider and birth location (hospital, birth center, home)
- Research childbirth education classes
- Discuss insurance coverage for birth
30By Week 30
- Enroll in childbirth classes
- Discuss pain management options with provider
- Choose pediatrician for newborn
- Start birth plan preferences list
36By Week 36
- Pack hospital bag (see checklist below)
- Install car seat correctly – get it checked
- Prepare nursery – safe sleep space ready
- Finalize birth plan with provider
38+By Week 38-40
- Review hospital route and parking
- Prepare siblings/pets for new arrival
- Arrange maternity/paternity leave
- Meal prep freezer meals for postpartum
Hospital Bag Checklist
For Mom:
- Comfortable clothes (2-3 outfits)
- Nursing bras/pads
- Toiletries, hair ties
- Phone charger (long cord!)
- Snacks, drinks
For Baby:
- 2-3 onesies
- Going-home outfit
- Blanket, swaddle
- Diapers, wipes
- Car seat (installed!)
For Partner:
- Comfortable clothes
- Snacks, water
- Phone charger
- Camera
- Pillow, blanket
Frequently Asked Questions About Pregnancy
How accurate is my due date?
Due dates are estimates – only 5% of babies arrive exactly on their due date. Full term is considered 37 to 42 weeks. First trimester ultrasound is most accurate for dating. Your provider may adjust your due date if early ultrasound measurements differ significantly from your LMP calculation. Use our pregnancy calculator above for an estimate based on your last period.
When should I feel the baby move?
First movements (quickening) are typically felt between 16-22 weeks. First-time moms may feel later (18-22 weeks) while experienced moms may recognize movement earlier (16-18 weeks). Movements start as flutters or bubbles and become stronger. By 24-28 weeks, you should feel regular movement. After 28 weeks, do kick counts – you should feel at least 10 movements in 2 hours.
Is it safe to exercise during pregnancy?
Yes! Moderate exercise is safe and beneficial for most pregnancies. Aim for 150 minutes of moderate activity per week. Good options: walking, swimming, prenatal yoga, stationary cycling. Avoid contact sports, activities with fall risk, and lying flat on your back after the first trimester. Always check with your healthcare provider before starting or continuing any exercise program.
What medications are safe during pregnancy?
Always consult your provider before taking any medication. Generally considered safe: acetaminophen (Tylenol) for pain/fever, some antacids (Tums), prenatal vitamins, certain antibiotics prescribed by your doctor. Avoid: ibuprofen (Advil, Motrin), aspirin (unless prescribed), most herbal supplements, and decongestants in first trimester. When in doubt, ask your healthcare provider.
Can I eat sushi or deli meat while pregnant?
It's recommended to avoid raw fish (sushi, sashimi) due to risk of parasites and bacteria. Deli meats should be heated until steaming hot to kill any listeria bacteria. Avoid unpasteurized soft cheeses (brie, feta, blue cheese) unless cooked. Cook all meats thoroughly. These precautions reduce risk of foodborne illness that can harm your baby.
How much weight should I gain during pregnancy?
Weight gain recommendations based on pre-pregnancy BMI: • Underweight (BMI <18.5): 28-40 lbs • Normal weight (BMI 18.5-24.9): 25-35 lbs • Overweight (BMI 25-29.9): 15-25 lbs • Obese (BMI 30+): 11-20 lbs First trimester: 1-4.5 lbs total. Second/third trimesters: about 1 lb per week for normal weight. Focus on nutrient-dense foods, not empty calories.
What's the difference between Braxton Hicks and real contractions?
Braxton Hicks (practice contractions): Irregular, unpredictable, don't get stronger or closer together, often stop with movement or position change, usually painless. Real labor contractions: Regular intervals, get progressively closer together, longer, and stronger, continue despite movement, felt in back and abdomen. Time them – if they're 5 minutes apart for 1 hour (first-time moms) or 7-10 minutes (experienced moms), call your provider.
When should I go to the hospital?
Call your provider or go to hospital if: • Contractions are 5 minutes apart for 1 hour (first-time moms) or 7-10 minutes (experienced) • Your water breaks (gush or continuous leak) – note color, time • Decreased fetal movement (less than 10 kicks in 2 hours after 28 weeks) • Any bleeding, severe pain, or warning signs listed above • You're less than 37 weeks and think you might be in labor When in doubt, call – that's what they're there for!
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Medical Disclaimer: This guide is for educational purposes only and is not a substitute for professional medical advice. Always consult your healthcare provider for questions about your pregnancy, any symptoms you experience, or before making any decisions about your health or your baby's health.