Is The Period Normal Post Intercourse?

Hi, me and my boyfriend had unprotected sex after a month on the depo (note that I spent the two months before on the pill, then switched) then waited until I had my period (which was two weeks long on the depo) and then we had unprotected sex days after now i'm on a second period that's lasted four days so far and it's orange/red and sometimes brown and sometimes just red I'm 18 5'3 no kids.