Bleeding during sex

Yesterday was the last day of my period and it was just spotting. I woke up this morning and nothing was happening down there so my boyfriend and I decided to have sex. We like it a bit rough and we went 3 rounds in a somewhat short time span. On the last 2 condoms there was a little blood (it gave the condom a pinkish tone). I usually don’t bleed when we have sex but we also usually don’t do it so many rounds. It wasn’t any more rough than normal though. After we finished I went to the bathroom and wiped and there was no blood on the toilet paper.

I was wondering if this was left over period or he was a little too rough. I’m not sure what happened to cause this. Thanks!