Ok Hey, Me And My Girlfriend Have Been Trying To

Ok hey, me and my girlfriend have been trying to have sexual intercourse but there's one thing stopping us. Everytime I finger her or try to penetrate her, she starts bleeding. This has happened the past 5 times we have tried to have sex. I don't know what it is because she says her cherry has been popped. I thought it was just her vagina stretching but it's not. Please help.