When can preg occur?: If you had a period 7/30, and unprotected sex around Aug 15, you may not be pregnant. However, keep in mind that your cycle is not " perfect". Your period is not expected yet so I don't understand why you said you missed a period. By your cycle length, your next period should be around 8/27, +/- 1 day, if the 1st day of your last period is 7/30. If in doubt, do a pregnancy test.
Answered 8/25/2014
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