I had sex with my ex in March on the 26th I got my period the 7th of april it was a full heavy period then I got with my boyfriend and had sex on the 21st of April I took a pregnancy test on the first of May and it was negative but on May 5th I got a faint positive and that night a pregnant 1 to 2 weeks on a digital that night and the next morning with first morning pee . Is there anyway it could be my exs? I didn't think so but people have told me other wise