So I'm 16 and my boyfriend and I usually have unprotected sex, but he had never finished inside me ever he always pulls out and we have never had a situation where he came in me. Ever since we started having sex which was September of 2015 my period has be seriously messed up. Now I'm 11 days late and I'm really stressed. I did take 2 emergency contraception pill because one time when he came it got on me (the crevice between my thigh and my vagina) so I had one and the other I took but I totally forgot why. I have taken 4 pregnancy tests and they are all negative. What should I do?