You can NEVER get pregnant from anal sex. That leads to her colon and not her uterus. They don't cross paths. With that said, hygiene is essential. Transfer of fecal matter when having sexual activity with the anus can lead to issues such as infection. To you and to her (urinary being quite common). Condoms also don't get pin size holes, that's a myth. That would jeopardize their integrity and they'd do what condoms do once you put it on and use it, split wide open. Condoms breaking are messing and show themselves. So the condom didn't break. So, A. no risk of pregnancy from anal sex and B. the condom didn't break. Pregnancy isn't a concern. Make sure you always respect her though.