Question give or take a few the withdrawl method...?

I've seen seriously of questions and answers on here clich¨| the withdrawal method doesn't work but they appear to only be discussion about if he's not wearing a condom. If he is wearing one, how economically will it work? I read somewhere that if he is wearing a condom and he pulls out then its almost impossible to capture pregnant.
Well there isn't much point using the subtraction method if he is using a condom because if he is using a condom, that will catch the sperm you don't want inside you.