When does morning sickness usually end?

For most women, nausea peaks at 9–10 weeks and resolves by week 14. About 10% experience nausea throughout pregnancy.

What is the viability cutoff?

Around 24 weeks with NICU support. Survival rates at 24 weeks are approximately 50%; by 28 weeks, they exceed 90%.

How accurate are due dates?

Only about 5% of babies are born on their due date. 80% are born within 2 weeks of the EDD.

When can I find out the baby's sex?

Anatomy scan at 18–20 weeks reliably shows sex. NIPT blood test can detect as early as 10 weeks.

How do I use FreeBMIKit's Pregnancy Calculator?

Enter your LMP date, conception date, or ultrasound data. Get your due date, trimester, current week, baby size comparison, and kick counter for third trimester.

How to Track Your Pregnancy Week by Week

How Pregnancy Weeks Are Counted

Pregnancy is counted from the first day of your last menstrual period (LMP), not conception. This means you're technically 2 weeks pregnant when conception occurs. Full term is 40 weeks from LMP.

Calculating Your Due Date

Due date (EDD) = LMP + 280 days (Naegele's rule). If you know your conception date, add 266 days. Ultrasound dating overrides LMP calculations if there's a discrepancy of more than 5–7 days.

The Three Trimesters

First trimester (Weeks 1–12): Organ development, highest miscarriage risk. Second trimester (Weeks 13–27): Growth accelerates, movement begins, energy improves. Third trimester (Weeks 28–40): Rapid weight gain, lung maturation, preparation for birth.

Baby Size Milestones by Week

Week 4: Poppy seed (0.1 cm). Week 8: Raspberry (1.6 cm, 1g). Week 12: Lime (5.4 cm, 14g). Week 20: Banana (25 cm, 300g). Week 28: Eggplant (37.6 cm, 1kg). Week 36: Honeydew (47.4 cm, 2.6kg). Week 40: Watermelon (51 cm, 3.5kg).

Key Prenatal Appointments

8–10 weeks: First ultrasound (heartbeat confirmed, dating). 11–14 weeks: Nuchal translucency scan (chromosomal screening). 18–20 weeks: Anatomy scan (gender possible, organ checks). 24–28 weeks: Glucose tolerance test (gestational diabetes). 36+ weeks: Weekly checks, Group B strep test.

Symptoms to Track Each Trimester

T1: Nausea, fatigue, breast tenderness, frequent urination. T2: Round ligament pain, heartburn, fetal movement. T3: Braxton Hicks contractions, back pain, shortness of breath. Track kick counts from week 28: 10 kicks within 2 hours.