Bleeding after sex

The other day my boyfriend and I had sex and afterwards he noticed he was bleeding. Like he says there was a cut on his penis that he noticed right after when he went to the bathroom. After a while I went to the bathroom and noticed that I was bleeding as well. At first I though maybe it was his blood but it's been a day and still hasn't stopped, well it's like brown spotting now. He is 100% sure it was his blood, I asked him like 10 time. I just feel like something is wrong.. I'm not supposed to get my period for another three weeks so it's not that.