Pregnancy Week by Week
Pregnancy is tracked week by week because development happens on a weekly schedule — the heartbeat is detectable around week 6-8, the anatomy scan is done around week 20, and full term is 39-40 weeks.
Enter your last period date to see which week you are in, a familiar baby-size comparison (from poppy seed to pumpkin), the typical milestone for your stage, your trimester, your estimated due date and how many days remain. It is a quick way to answer "how far along am I?" without counting on a calendar.
Medical disclaimer: This tool gives general estimates only and is not medical advice. Always confirm dates, results and any concerns with your doctor or midwife.
Formula
Current week = floor((today − LMP) / 7) EDD = LMP + 280 days
Example
LMP = 1 June 2026, today = 15 September 2026. Week 15, second trimester. Baby ≈ size of an apple; due date ≈ 8 March 2027.
How to Use
- 1. Select the first day of your last period.
- 2. Click "Calculate".
- 3. Read your week, size comparison and milestone.
Frequently Asked Questions
How far along am I?
Your week is counted from the first day of your last period — the table shows it directly.
How many weeks is pregnancy?
About 40 weeks from LMP; 37-42 weeks is the usual delivery window.
When does the second trimester start?
Week 14. Third trimester starts at week 28.
Is the baby size exact?
It is an average comparison — actual growth varies and is checked by ultrasound.