If am on birth control and he is not using a condom can i get pregnant?

Nothing's 100%: Assuming you are referring to oral contraceptive pills (ocp), the failure rate for typical use is about 8-9% per year, and "perfect" use is about 0.3% per year. So yes, it is possible to get pregnant while on oral contraceptives (birth control pills) but not likely.

Chances are low: if your are taking the oral contraceptive consistently and correctly.