My boyfriend and I had sex (both our first time) 2 nights ago,after it happened there was no blood or me at all,just a little brown discharge with mild cramps the next day.Now it has been 2 days and i have cramps very similar to the ones which i get when im on my period and a the discharge has changed to blood,what is this?is it normal,please help me i am very scared,we used a condom and i'm almost 100% sure that there's no way i could be pregnant but i don't know what to do,did having sex bring on my period? i am not due for that until the 14th,thanks in advance for reply.