Fingers in ass

Last night my boyfriend and I were having sex doggy style. His penis was in my vagina and when he started getting rough he stuck his thumb in my butthole. But it seemed like more than one finger. After awhile I somewhat liked it but it just felt so weird. Later that night after using the bathroom when I wiped there was blood on the toilet paper.. Is that normal? Because I kinda want him to try his penis next instead of thumb 🙈