So last night my boyfriend and I were together and he was fingering me while I was sitting down and there was no blood but I stood up and he was fingering me while I was standing (same speed and roughness as usual) and there was a lot of blood. It looked like blood from a nose bleed or a body cut. Not like period blood This has happened before when I stood up but with not as much blood, like only a few drops. I couldn't feel it at all, no pain. I'm 16 and only had sex and been fingered by him. Why has this happened? P.s. My period ended last Friday ( 10.02.17)