Bleeding after sex?

Just want to know if I should be concerned or if this is normal.. Will go to the doctor if it doesn't stop..
Around 5 hours ago I had sex.. It was very quick not a lot of lubrication(which is what I think was the problem). Afterwards when I went to the bathroom I noticed bright red blood coming out.. Not a whole lot but it was a bit...
Since then it has mostly stopped but a little still comes out, now light brown..
Is this normal? I'm thinking I got a bit injured because of friction and the lack of lubricant..
Has anyone had experience with this?
Thank you!!