My girlfriend and I don't have sex but we do fool around. She loves it when I use my index and middle fingers. Often after I finger her, I have a thin layer of blood on my fingers, not much, just enough to see a little red. This seems to happen at any time of the month. Should I be worried? Also, I am not very experienced sexually, but I can also feel a very firm round structure deep in her vagina on her left side. What is that?