Even if you combined it with the rhythm method, I wouldn't trust it. All it takes is one time, and there is pre-ejaculate.
Agree with above. The pull out method is not a form of birth control. You've just been lucky. Lots of babies are born from withdrawal. Indeed, there is sperm in pre ejaculate that can impregnate you. good luck
Its my understanding that sperm is released throughout intercourse not just when he ejaculate so you better be careful...correct me if I'm wrong