Bleeding after sex?

Last week on the 3rd I had unprotected sex (but I took the pill a day and a half later). I've had sex twice before, but the first wasn't very... good; the second time it was fine but we weren't going for that long but I felt fine. This time, it felt okay but there was some discomfort. The guy was very savvy and we did it in a few different positions that I hadn't used before (sorry if TMI). However, he eventually found that I was bleeding slightly, so we stopped. I went to the bathroom and it was almost like a light period, but I hadn't bled before during sex... For the past 7 days or so, I've been bleeding on and off. But, it's not period blood. I thought it must have been my hymen, but I'm not sure that it's common to still be bleeding from the hymen tearing after 7 days. I'm considering asking a professional, but I'm not sure if it's necessary. There is minimal discomfort, but I'm just a little concerned with regards to the cause of the bleeding!

My last period ended on the 1st of July, and this took place on the 3rd.