Anal sex

I just had unprotected sex with my boyfriend of 3weeks and we tried anal together and he came in my Anus I'm 22 don't live on my own just quit my job don't have my license and I'm excited to be a mom someday and if I do get pregnant from this I'm going to stress out because it's only been 3 weeks....he has no job no license and lives in a nasty trailer with his dad I'm scared but not scared but can you get pregnant from unprotected anal sex.