Possibility in this situation?

Stephany
So about a month ago I was having sex with my SO and we were using a condom, then he thought it would be a "fun idea" for him to take it off right in the middle of it ( yeah he's very immature sometimes). When he did he told me and I made him immediately pull out. We are sure he did not cum before, or after he took it off. What are my chances of getting prego?