Longer is higher: There is no hard and fast number. Chances are if you have normal periods and then miss one after unprotected sex, pregnancy is the cause. But that is not absolute. Check a home pregnancy test, and follow the instructions. If it is negative after a week, and if you still have no period , see your doc for a blood test. Assume you are PG till you know: no drugs, alcohol, meds, smoking!
Answered 8/10/2014
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