Anyone know what this is?

So I just recently lost my virginity with my boyfriend of 6 months and the first time hurt so much. I was bleeding on and off for like 2 days but it wasn’t painful after the first night. I wasn’t super worried because my sister told me she experienced pain when she started having sex. The thing was, I tried having sex again today to see if maybe it would hurt less after the first time, etc. but I started bleeding really bad while we were doing it and we had to stop. It didn’t hurt as much as the first time though, and I didn’t even notice it until he pointed out that I was bleeding profusely. I don’t know if this is temporary or if it might be a long term problem? Has anyone else had this problem?