Spotting after sex? 🤔

Well. I've just had sex with my boyfriend a few hours ago, but I've noticed some little drops of blood in my underwear and when I go to the bathroom. We have just tried a new position, reversed cowgirl in a chair; it was new to us, since that way he could go deeper than any other position we have tried. While having sex I had some pain down there, specially when he pushed himself even deeper, I think he was right there hitting my... pelvic floor? Or let's say the end of my vagina, don't know how it's called. It ached a little bit, but I ignored it because everything else felt soooo good. Is it possible that I have injured myself somehow?