Pregnancy Tools
Pregnancy Week Calculator
Find out exactly how many weeks and days pregnant you are and track your progress.
Calculate your week
Enter the first day of your last menstrual period.
Enter the first day of your last menstrual period to calculate how far along you are.
Your week will appear here.
Enter the first day of your last period and we'll work out how far along you are.
The journey
A trimester guide.
First trimester
Weeks 1–13. Major organs begin to form, morning sickness may occur, fatigue and mood changes are common, and you'll have your first prenatal appointments.
Second trimester
Weeks 14–27. Energy levels improve, your baby bump becomes visible, you'll feel your baby's first movements, and have your anatomy scan ultrasound.
Third trimester
Weeks 28–40. Rapid baby growth, Braxton Hicks contractions, the nesting instinct kicks in, and it's time to prepare for delivery.
More pregnancy tools.
Explore our collection of calculators and trackers to support your pregnancy journey.