I last had sex on February 24th, and I started my period about a week later. But now (march 18th) i have a thick discharge, at first I thought i was spotting, but it's not the right color.. Iv been on amoxicillin for an ear infection and I guess that might have something to do with it. But I honestly have no idea.. I'm concerned that it might be a sign I pregnancy because I didn't use any form of protection. I'm taking a store bought pregnancy test later today, but I'd love some input form someone who knows more than I do! Thanks!