My boyfriend and i didn't use protection, he went from my anal to my vagina and ended up ejaculating in my anal, is there a chance i can be pregnant?

If he ejaculated in : Anus and did not leak anything in the vagina, then no but you should be worried about getting a vaginal, cervical or pelvic infection because the rectum has bacteria that can cause a bad female organ infection and anal sex can damage the rectum and rectal sph., a condom should always be used if you do have anal sex and you should never go from the anus to the vagina, i recommend no anal sex.