Pregnancy week calculator
Enter the first day of your last period: you see how many weeks along you are, your trimester and your estimated due date.
Weeks of amenorrhea or weeks of pregnancy?
Professionals count in weeks of amenorrhea, from the first day of the last period. A pregnancy lasts 41 weeks this way. The trimester changes at 14 weeks, then at 28 weeks.
Frequently asked questions
What is the difference between weeks of amenorrhea and weeks of pregnancy?
Weeks of amenorrhea are counted from the last period, weeks of pregnancy from conception: there is about a 2-week gap.
How long does a pregnancy last?
41 weeks of amenorrhea to the due date, about 9 months.
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