I have had sex a few times, unprotected, since my last period, but its getting really painful now, I'm having very bad cramps, but I'm not due on for two weeks? I've had no blood, and no sickness yet, but its worrying me, I'm 16, and have had periods since in was 11, so there are all sorted and normal, but this isn't, it hurts really bad.. Help please? D:

