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Gestational Age Pregnancy is measured using “gestational age.” Gestational age starts on the first day of a woman’s last menstrual period (LMP). Most people think of pregnancy as lasting nine months.

And it’s true that a woman is pregnant for about nine months.

But because pregnancy is measured from a woman’s last menstrual period — about 3-4 weeks before she is actually pregnant — a full-term pregnancy usually totals about 40 weeks from LMP — roughly 10 months.

Many women do not remember the exact date of their last menstrual period — that’s OK.

Also, find out more about getting help if you're not getting pregnant.

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