Im 21 but my GF is 17. we had unprotected sex 3 weeks ago and since then she had bad cramps on her stomach but no nausea or morning sickness. it stopped just before her period... well the night before her period we had sex again (unprotected) and the morning she started wth her period. could she be pregnant even though she is having her period. im pretty sure i did not ejaculate inside her but im still a bit scared of pre-ejaculation.any help pls...