If you're in birth control then its not unprotected sex (as long as we're talking about pregnancy).

There is still a chance of pregnancy, but its less than 1% when taken correctly. If you have the occassional mess up with your pills and/or are not very confident with your pills then you should look into doubling up birth control methods and pair pills with condoms or spermacides.

I agree with Maddie34, it isnot unprotected if you are on birthcontrol, however you can still get std's if not using a condom.

As far as being pregnant? I am not a doctor but i would doubt it.