i was wondering i had 2 periods in the same month... this never happens to me i am always regular. i had my period august 1st and again august 27. i also had unprotected sex. i went to the er and they said i was not a miscarriage and i was not pregnant. this happened 3 years ago to when i went to the dr.s office and it was negative but 2-3 weeks later it was positive.