what's going on??

okay me and my boyfriend have sorta been trying to get pregnant for about two months now, and today marks the fifth day past the end of my missed period. the day I was supposed to start nothing happened except a little spotting, and the next day I had severe lower tummy pains that lasted about 5 minutes. they hurt so much worse than period cramps, like someone was twisting a knife in my tummy. ive also had a good bit of a white discharge, and a lot of pain after sex. it'll mostly set in a moment after intercourse has ended, but today it got severe and happened during, and even before he penetrated me (after some foreplay in which I climaxed.) I have no idea whats going on...a few days ago I got two negatives on HPT's and I don't wanna get too hopeful that it was too early and that this could really be it. please HELPPPPP D: