Bleeding after sex?

Meadow

Recently or last month I lost my virginity to my boyfriend. It didn’t hurt and I didn’t bleed too much. We’ve done it many times afterwards. Well one day or yesterday we did it again. I’m on period(getting off) and he was rough. It hurt a lot because I wasn’t as cared for down there. Well I went to the restroom and seen there was a lot of blood. I wasn’t surprised until it was still bad after a few hours past. Any ideas?