I can't remember when the first day of my last period was. I think it was between June 1st - June…

I can't remember when the first day of my last period was. I think it was between June 1st - June 5th. Had unprotected sex several times the week of the 12th - 20th and im feeling extremely crampy, achey all over and achey a little but lower back. Had to leave work today because of my digestive issues which have NEVER been this way before, felt ready to puke like my stomach was backed up to throat and sweating...bloated, gassy, tired, very tired. White, milky discharge. Boobs are just starting to hurt, but they usually do before period. I've been pregnant before...and I feel like I knew...but I wasn't expecting it and was young and naive. Now I'm really focusing on it and feel like some of the stuff is in my head. Negative tests...too early to tell? I've spent so much dang money on tests cuz I'm freaking out. Its so odd...I don't want to be pregnant cuz the guy would be non existent...but I've convinced myself I am so much that if I'm not ill be dissapointed in a way. Help.