bleeding during/after sex

Bluj

So my boyfriend and i have been sleeping together for over a year now. Every so often, we get rough and I bleed. Not a whole lot, but enough to make us stop. It's not painful at all, just concerning. I have a Dr's appointment soon regarding it. However, the next day, around noon, had a little bit of pink when I wiped. Nothing since. Maybe I tore last night and my body is still healing? Implantation bleeding? Any ideas? I'm really nervous...