Could I be pregnant?

Me and my fiancé have been having sex unprotected I was supposed to get my depo shot at the beginning of june but I missed it I got my period for 7 days and then it went off but I got this unusual sharp pain where my in my lower abdomen and then I started bleeding again like a period but light only when I wipe that only lasted 3 days I’ve randomly went gained weight, I have bloating, my nipples are tender and my breast have grown with blue veins showing...

Ive tested but I’ve been getting negatives