Anal sex....

I had unprotected anal sex yesterday morning. The person I did this deed with I know doesn't have any diseases becuz I have given him oral sex many times and nothing happened unless that's not as dangerous. He is really good at pulling out and he said he pulled out before he came and actually came on the outside away from me and I had my hand covering my vagina opening until he told me he was out and I went straight to the bathroom and wiped front to back and then got new tissue and kept checking throughout the day day and I also had a bowel movement which is normal for me after that. I just got off my period but I am a teen so idrk when I am fertile or not but if there is a possibility I am or could get pregnant I have a friend who can hopefully get me a plan b but I have read the side effects and I am scared cuz I don't want my mom to find out if I am acting weird and I don't want my period to be late. Anyone have this happens to them