Sex and blood

Just wondering if this is normal I had sex the last day of my period ( I had no blood though during when we had sex ) but the next morning I noticed light spotting bleeding the next morning afterwards it was really really light and pinkish / brownish also had sex unprotected 2 weeks before that just making sure I'm ok but I'm in the birth control not sure if I'm taking it properly when I had sex 2 weeks ago I think I took it and this recent time I was drunk so I'm confused ... anything helps pleaseee