Umm no. Learn more about sex, ALL kinds of it before you do it. Ask your parents!! It would be a whole lot Less awkward to ask them about sex rather than telling them your having a baby... For gods sake.
I reckon you should stay away from all forms of sex if it has you that nervous. I took a gander at your other questions and you may wanna gather up some of those handy dandy pee sticks and check to see if you need to beg for daddy's forgiveness.
no, you can't get pregnant, but this is extremely dangerous. you should always wear a condom, not just to prevent pregnancy, but to reduce the risk of STDs. Anal sex is particularly risky due to a high probability of tearing that can occur in your anus making you more likely to contract HIV and other diseases/infections.
Pregnancy happens when a sperm interacts with the egg inside the uterus. Vaginal intercourse is the only way to get pregnant. So the answer is No. But using protection when having sex is always better than non at all. Don't be shy about getting birth control to prevent pregnancy. Chances are if you're having anal sex it won't be long before you're having intercourse. Be smart.