Bleeding STILL !!

I had sex with my boyfriend not to long ago and it was pretty dark in my room. I was pretty wet but I still ended up bleeding. I don’t know why, this isn’t my first time having sex and I haven’t bleed in months so I don’t understand why I bleed this time. We tried a new position which maybe caused me to bleed since he went deeper in me but other than that I have no idea why I was bleeding. Has this happened to anyone else ? I’m scared that somethings wrong with me. ( I don’t have and STD either )