so around the first of this month I had sex and the guy I had it with actually cummed inside of me 3 times , for the 3 different times we had sex , anyways I missed my period this month and theirs only 2 more days left on this month ( so im sure I'm not starting it this late) and the pregnancy test I have took come out negative , I have been getting the 88¢ ones is it maybe that their not working or what can it be ?? someone please help !! ):