is it possible ....

I know I am going to get shit for this but I'm curious. I am on birth control (the mini pill) so I am supposed to take it at the exact same time every day. well that doesn't always happen. I just recently had my son (he's almost 4 months old) me and my boyfriend have sex very regularly and he pulls out. is there a chance I could be pregnant since I mess up on my bc a lot? I wouldn't be upset just curious if it is a possibility.