Bleeding After Sex 3 Weeks 6 Days

So this morning I got home around 7 am and my boyfriend and I decided to have sex. *TMI* it was from the back and after he came, I went to the bathroom and wiped and it was like a dull red blood on the tissue. As I kept wiping it tapered off some, I wasn’t cramping or anything, and when I just woke up maybe 30 minutes ago, it was still some light spots when I would wipe. I am not sure if I should be worried, go to the Er or if it’s normal.