Ok My Last Period Was Feb.4th it went off early and after that i ve been having unprotected sex and he ejaculated in me each time so i took a home pregnancy test and they both were negative then i started getting a brown discharge when my period was late for this month (March) so i got a blood test and it was negative and now my period is on this month (March) , my question is how is it that im not pregnant ? butmy period this month i dont have any cramps and it started offsuper light now its heavy like my normal periods.