(Tmi?) Bleeding after sex

Marenda
I'm not sure if this is the right place for this. My fiancé and I had some really rough sex the other day and afterwards when he pulled out there was blood everywhere. It was spotting it was like I had restarted my period or something. At that time I had actually stopped my period three or four days previously. It's not like I'm not used to sex either so I was entirely baffled. Can anyone tell me what this was or may have been?