I had my periods, then unprotected sex right after, and immediately took the pill. my period came again right after that. So in 2 weeks I had 2 periods. Now is has been 1 month and 3 weeks, and my period still hasn't come. I took a pregnancy test, and it was negative. My concern is - is having a second period right after you just had one, harmful to your body - and will this cause infertility? please if anyone can answer, please help!