Pregnancy Week Calculator
Calculate what week of pregnancy you're in and track your pregnancy progress week by week.
Input
Enter either LMP or due date (or both)
Results
Enter your information to see results
How is Pregnancy Week Calculated?
Pregnancy is typically calculated from the first day of your last menstrual period (LMP), not from the date of conception. This is because the exact date of conception is often unknown, but the LMP date is usually known.
A full-term pregnancy is approximately 40 weeks (280 days) from the LMP. This means you're already considered 2 weeks pregnant at the time of conception, since the LMP date is used as the starting point.
Understanding Trimesters
First Trimester (Weeks 1-13)
Early development, morning sickness, and fatigue are common.
Second Trimester (Weeks 14-27)
Often called the "golden period" - energy returns and baby bump becomes visible.
Third Trimester (Weeks 28-40)
Final growth phase, preparation for birth, and anticipation of delivery.
Frequently Asked Questions
Q: Why am I already 2 weeks pregnant at conception?
A: Pregnancy is calculated from the first day of your last menstrual period, which is typically about 2 weeks before conception occurs. This standard method ensures consistent dating across all pregnancies.
Q: What if I don't know my LMP?
A: You can use your due date instead. If you know neither, consult with your healthcare provider who can help determine your gestational age through ultrasound.
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