Also, don't go back to front. You can go front to back but if you go back to front you are at risk for infections n stuff. Just don't hurt yourself and you'll be fine! (:
basic rule is if it hurts, stop. if your body is used to rough sex then you'll probably be fine but start slow is my advice and go from there. a safety word is always good too.
Anal gave me hemorroids while pregnant with my last... and i am not very big and my weight was normal not over at all (im also young) so after a few times we decided not to anymore... and rough is fine as long as he doesnt hurt you which would be your Q that the baby is in danger.
Uhm when we were rough I.bled so.we aren't doing that again. Anal is fine as far as I.know. but don't go too rough on the.vaginal sex especially during first trimester.