So i took a plan b 3 days after my boyfriend and i had sex for the first time because i always over think everything, i had sex on the 27th of may which isnt in my fertile window, and took the plan b on the 30, on the 4th i got my period at the regular time (it was just a little lighter than usual but they said plan b can do that) and ive been down for a couple days now but for 2 days ive been having really bad abdominal pain in my left side, could i be pregnant still?