Alright guys i need some help here. I started my period March 12th and it lasted till March 16th. I'm only 21-23 days apart from each of my periods. My boyfriend was home for 2 weeks and everynight we did stuff that he busted in me. The ovulation calendar on mostly all websites say i was most fertile march 19-21 i believe.If i my boyfriend went inside me what is the chance im pregnant. I have been having lower abdomen pain for the last 2 weeks now. Its kinda like a cramp but alil worse. Ive also been having some back pain and peeing alot. My breast dont really hurt they only hurt on the sides closest to my armpit. I took a pregnancy test by it was neg but i also took it 7 days before i was suppose to have my period. I'm suppose to start my period April 9th. Can anyone help me out or give me information PLEASE