From the first day of your last menstrual period (LMP). Naegele's rule: LMP + 7 days - 3 months + 1 year = Due date. Total: 40 weeks (280 days).

End of week 40. Calculated using Naegele's rule: LMP + 280 days. Only 5% of babies are born on the exact due date.

Pregnancy is divided into 3 trimesters: 1st (weeks 1-13), 2nd (weeks 14-27), 3rd (weeks 28-40). Each covers different developmental stages.

Normal pregnancy lasts 37-42 weeks. 40 weeks is considered full-term. Birth before 37 weeks is preterm, after 42 weeks is post-term.

Divide days from LMP to today by 7. For example, 100 days = 14 weeks 2 days.

Standard formula: LMP + 7 days - 3 months + 1 year. For example, June 15, 2026 = March 22, 2027.

Only an estimate. Only 5% born on exact date. First trimester ultrasound more accurate.

Missed period, breast tenderness, nausea, fatigue, frequent urination, smell sensitivity.

Urine test 1-2 days after missed period. Blood test (beta hCG) 10 days after conception.

First at 6-8 weeks. NT at 11-14 weeks. Detailed at 18-22 weeks.

Embryo becomes fetus, organs form, heartbeat begins (week 6). Most critical period.

Baby grows, movements felt (weeks 16-20), gender can be determined.

Baby gains weight rapidly, lungs mature, moves to head-down position.

Birth before 37 weeks. Rate in Turkey is 7-10%.

From embryo transfer date. For 5-day blastocyst: Transfer date - 19 days = LMP equivalent.

Usually 14 days after LMP in 28-day cycle. Ovulation = LMP + (cycle length - 14) days.

Yes, HızlıTools Pregnancy Calculator is completely free. Unlimited use, no registration.

No, informational only. Always consult your gynecologist.

Yes, all calculations in browser. No data sent to server. KVKK and GDPR compliant.

Due date same, but birth usually earlier. Twins average 36 weeks, triplets 32 weeks.

Pregnancy week from LMP. Fetal age from conception, usually 2 weeks less.

First visit at 6-8 weeks. Regular checkups every 4 weeks until 28, every 2 weeks until 36, weekly after.

First trimester screening, NT, triple/quad test, glucose challenge, detailed ultrasound, GBS.

Normal BMI: 11-16 kg, underweight: 12-18 kg, overweight: 7-11 kg, obese: 5-9 kg.

Naegele's rule not reliable. First trimester ultrasound with CRL measurement needed.

Determined by due date. March 21-April 19 = Aries, April 20-May 20 = Taurus, etc.

Week 8: Raspberry (1.6cm), Week 12: Lemon (6cm), Week 20: Banana (25cm), Week 40: Watermelon (51cm).

First-time mothers: 18-20 weeks. Previous pregnancies: 16 weeks.

Detailed ultrasound at 18-22 weeks. NIPT blood test from 10 weeks with 99% accuracy.

Done at 11-14 weeks. Measures fluid at back of baby's neck. Combined with blood test for Down syndrome screening.

Detailed ultrasound at 18-22 weeks. Examines all baby's organs for structural abnormalities.

Done at 24-28 weeks. Screens for gestational diabetes. 50g glucose, blood sugar after 1 hour.

Group B Streptococcus test at 35-37 weeks. Checks for bacteria that can pass to baby during birth.

Non-Stress Test monitors baby's heartbeat and movements. Done after 32 weeks.

Diagnostic test at 15-20 weeks. Takes sample of amniotic fluid for genetic testing.

Chorionic Villus Sampling at 10-13 weeks. Takes placental tissue for genetic testing.

Non-Invasive Prenatal Testing. Blood test after 10 weeks. Screens for chromosomal abnormalities with 99% accuracy.

Yes, moderate exercise recommended. Walking, swimming, prenatal yoga safe. Avoid high-impact sports.

Raw meat/fish, unpasteurized dairy, high-mercury fish, raw eggs, alcohol, excessive caffeine.

Folic acid (400-800mcg), iron, calcium, vitamin D, DHA. Start folic acid before conception.

Generally safe until 36 weeks. Avoid long flights after 28 weeks. Stay hydrated, move frequently.

In Turkey, starts at 32 weeks (34 for twins). Total 16 weeks (8 before, 8 after birth).

Develops during pregnancy in 2-10% of women. Usually diagnosed at 24-28 weeks. Managed with diet, exercise.

Pregnancy complication with high blood pressure and organ damage. Usually after 20 weeks. Requires immediate medical attention.

Placenta covers cervix. Causes bleeding. May require C-section.

Placenta separates from uterus before birth. Causes bleeding and pain. Medical emergency.

Practice contractions. Irregular, painless, don't increase. Start around 20 weeks.

Regular contractions (every 5 minutes), water breaking, bloody show, back pain.

Labor started medically before natural onset. Reasons: Overdue, health risks. Methods: Pitocin, membrane sweep.

Surgical delivery through abdomen. Reasons: Baby distress, breech, placenta previa. Recovery 6-8 weeks.

Pain relief during labor. Numbs lower body. Given through catheter in back. Most common pain relief.

Vaginal delivery without medical interventions. No epidural, no induction. Shorter recovery.

Delivery in warm water pool. May reduce pain and stress. Requires trained staff.

Vaginal Birth After Cesarean. Success rate 60-80%. Requires careful monitoring.

Affects 10-15% of mothers. Symptoms: Sadness, anxiety, fatigue. Usually starts within 4 weeks after birth.

Wait 6 weeks after vaginal, 8-12 weeks after C-section. Start with walking, pelvic floor exercises.

If not breastfeeding: 6-12 weeks. If breastfeeding: May not return for months.

Yes, breastfeeding not reliable contraception. Ovulation can occur before first period.

WHO recommends waiting 18-24 months. Allows body to recover.

Embryo implants outside uterus (usually fallopian tube). Medical emergency.

Abnormal growth of placental tissue. No baby develops. Requires treatment.

Pregnancy loss before 20 weeks. Occurs in 10-20% of pregnancies. Usually chromosomal.

Vaginal bleeding, cramping, tissue passing, decrease in pregnancy symptoms.

Most cannot be prevented. Healthy lifestyle may reduce risk: No smoking/alcohol, take folic acid.

Fetal death after 20 weeks. Occurs in 1% of pregnancies.

Chromosomal disorder (trisomy 21). Causes intellectual disability. Screening tests available.

Neural tube defect where spine doesn't close properly. Folic acid before conception reduces risk.

Opening in lip and/or roof of mouth. Can be repaired with surgery.

Pregnancy duration from LMP. Different from fetal age (from conception).

Time since conception. Usually 2 weeks less than gestational age.

Crown-Rump Length measures embryo from head to bottom. Most accurate dating method.

Biparietal Diameter measures width of baby's head. Tracks growth.

Head Circumference measures around baby's head. Tracks brain development.

Abdominal Circumference measures around baby's belly. Tracks growth and nutrition.

Femur Length measures baby's thigh bone. Tracks skeletal development.

Estimated Fetal Weight calculates baby's weight. Accuracy ±10-15%.

Amniotic Fluid Index measures fluid volume. Normal: 5-25cm.

Placenta grade (0-3) indicates maturity. Higher grade = more mature.

Measured by ultrasound. Normal: >3cm. Short cervix increases preterm birth risk.

Distance from pubic bone to top of uterus. Should match gestational age in cm.

Blood type protein. Rh-negative mother with Rh-positive baby may need RhoGAM injection.

When mother and baby have different blood types. Can cause jaundice or anemia in baby.

High blood pressure after 20 weeks. Different from preeclampsia.

Liver disorder causing severe itching. Usually in third trimester.

Severe nausea and vomiting beyond normal morning sickness. Causes dehydration.

Pelvic pain due to ligament relaxation. Common in pregnancy.

Sharp pain in lower abdomen/groin. Caused by stretching of ligaments.

Leg pain from pressure on sciatic nerve. Common in third trimester.

Hand numbness/tingling from fluid retention. Common in third trimester.

Swollen veins from increased blood volume. Common in legs.

Swollen veins in rectum from pressure and constipation. Common in third trimester.

Slowed digestion from hormones. Prevented with fiber, water, exercise.

Burning sensation from stomach acid reflux. Prevented with small meals.

Difficulty breathing from uterus pressing on diaphragm. Common in third trimester.

Fluid retention causing swelling. Common in third trimester. Mild swelling normal.

Difficulty sleeping from discomfort, hormones, anxiety. Common throughout pregnancy.

Emotional changes from hormones and stress. Common throughout pregnancy.

Urge to clean and prepare for baby. Common in third trimester.

Celebration before baby's birth. Gifts for baby and mother. Usually at 7-8 months.

ID, insurance, birth plan, comfortable clothes, toiletries, phone/charger, baby clothes, car seat.