Human pregnancy lasts 40 weeks, or just more than nine months, from the start of the last menstrual period to childbirth.

The primary sign of pregnancy is missing one or more consecutive menstrual periods. However, because many women experience menstrual irregularities that may cause missed periods, women who miss a period should see their health care provider to find out whether they are pregnant or whether there is another health problem.

A pregnancy test is the best way to determine if you are pregnant. Home pregnancy test kits are available over-the-counter and are considered highly accurate. A health care provider can also do a pregnancy test.

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