I'm 20 and sexually active. I have been using a hairbrush with a hard plastic handle to masturbate recently and when I get a little more intense with it I have been having a bit of blood coming out with the brush when I take it out. This is before orgasm. Today I was fingered by my partner for the first time in a while and he used 4 fingers. It was kinda rough but in the moment felt good and I didn't notice. He pulled his fingers out and ... Blood! Is it just from the roughness ? I am usually EXTREMELY wet, especially when with another person and tonight I definitely was.. So should I be concerned of an STD or something ? Let me know please !