So me and my BF had sex on my period on the last day my period is usually always 4 days long and he told me he busted so we were worried looking stuff up and had no right answers also I had bleeding for 4 more days and I don't know why and I got my first depo shot the next day after the bleeding and that sounds dumb but I was scared to tell my mom or ask doctor while my mom was there and now I'm having a few pregnancy symptoms could this be ?