bleeding from sex

When I first lost my virginity about two years ago, I bled which I know is totally normal. I had consistent sex for the next year and a half with my boyfriend until he left for the Army. We got to see eachother and had sex for the first time in 3 months. After sex, I realized I was bleeding slightly. Way less than I was when I first lost my virginity. We haven't had sex in about two months and tonight we sent eachother a few sexy videos. After I finished one, I realized I was bleeding again, just a tiny bit. I was wondering if it's generally normal to bleed a little bit after not having sex for a while? Or is it something I should be worried about? Thank you!