me and my boyfriend have been having unprotected sex for about a month now. we have sex a lot too. he doesn't wear a condom and i'm not on birth control. stupid i know. he has never pulled out that i know of, but he has came inside of me. my period is very irregular and i have not missed it yet. however, in the past week i have been having very painful menstrual like cramps, but i already had my period this month. whats going on? could i be cramping because i'm pregnant? whats going on?