I lost my virginity May 24th and didn't get my period that month until June 21at then again July 28th, both regular 5 day periods. I have been nervous about being pregnant since then and my body has been whacked. Not on birth control or had sex since then. My periods are irregular and I think I was supposed to get my period August 31st and instead I've been having brown discharge, kinda mucus looking. No odor or anything but why?