I had anal sex & since I've been bleeding for a week. I saw blood from my rectum and from the vagina. Whats wrong with me? Can be I pregnant?

Likely a small tear. Though it is hard to say without an exam, it seems likely that you have a small anal tear (perhaps similar to a tear in the hymen with first vaginal sex). Pregnancy is very very unlikely if this is the only exposure. If the problem continues, exam is important.