My boyfriend and I have ben sexually active for over 2 yrs now. We don't use protection, he just pulls out before he ejaculates. What are the chances I could get pregnant or is he sterile?

Very high!

My boyfriend and I have ben sexually active for over 2 yrs now. We don't use protection, he just pulls out before he ejaculates. What are the chances I could get pregnant or is he sterile?

Obviously it has worked for you for the last two years... :) When used correctly, it can be fairly effective. There are more reliable forms of birth control, but for some couples they are not options they are interested in.
Certainly with any form of birth control, pregnancy will be a possibility.

You have been very lucky the past 2 years. The pull-out method is definitely NOT 100% effective (nor is any other form of birth control.) When a man becomes aroused, pre-*** forms and seeps out of the penis. Although it is basically diluted ejaculate, there are still sperm cells in the fluid. The possibility of one of those little guys migrating toward one of your eggs is likely. To quote DoulaLC, there ARE more reliable forms of birth control. Research your options because there are plenty. Hope this helps!