He wasn't honest

We have a 4 month old baby and whilst pregnant we both talked and decided that we would try for another when baby is 6 months old as we want them close together so they will grow up together and be close. The subject came up last night about when we would have full sex as right now we use the pull out method and I'm on no contraception but now he's decided he doesn't want another and I'm devastated. He always knew I wanted 2 babies and so did he, he is adamant he doesn't want another and its a deal breaker. I feel lile everything we talked about was a lie, what are my chances of getting pregnant with the pull out method?