Am I overthinking this to much

So on april 17th last month me and my bf had sex. I got my period a few days later like I was supposed to. Then yesterday he was fingering me and I started bleeding it was very little so we went home and i went to the bathroom to clean up bc we weren't home and there was no blood. Could that have been implantation bleeding, or just from him going a little to hard? ( hes gone that hard before or harder, and I've never bleed, I didnt even bleed when I lost my virginity)