Pregnancy tests work by detecting human chorionic gonadotropin (HCG), a hormone your body makes when you’re pregnant. You can carry out most pregnancy tests from the first day of a missed period. If you don't know when your next period is due, do the test at least 21 days after you last had unprotected sex. You can do a pregnancy test on a sample of urine collected at any time of the day. There are a few things to keep in mind when you take a home pregnancy test, including: Use your first mornin

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