So I just lost my virginity to my girlfriend who is not a virgin, but it hurt for her and she bled.?

This is weirding me out. She told me she had sex with her first boyfriend more than once, but it never hurt and she never bled. Upon first penetrating her, she sharply exhaled in pain, and after we were done, my crotch was covered in her blood. I'm aware that a hymen can heal, but it apparently didn't break in the first place. How is it possible that her first time was painless and had no blood, but now I'm the one that hears her cry and get bled on?