If i use my birth control pills correctly and the condom breaks but it just pre cum , do i have any chance to be preganant ?

Very low risk: If you are taking your pills correctly the risk of pregnancy is extremely low. The concern is primarily for the risk of infections. If you have pain, bleeding, or a discharge you need to be seen and tested. Good luck. Keep trying to be safe. It sounds like you are very responsible.

Very very low : Birth control pills are very effective when used correctly. Pregnancy is highly unlikely

Small chance: If birth control pills are taken correctly there is very little chance of pregnancy. However, no forms of birth control are 100 % so if you are concerned take a pregnancy test. I think you have very little chance of pregnancy in the situation you describe.