hi i am 15 years old to sundays ago me nd my girl had sex after we did it i took of the condom put my pants on and we started making out and she got on top of me can sperm go through dat?? also i wanted to know if its normal if my girlfriends period used to be on the 19th then it changed to the 24th 3 months ago and now its the 17th and shes already cramping i wanted to know if it was normal for her cramps to be early or her periods starting early? please answer i need help