Pregnancy scare

So I had a talk with my boyfriend about. Children. I had to stop birth control for personal reasons and was clear to him about that. We discussed about making sure we are careful still because it is not the time for a child. (I already have one. Not his blood, but hes the father type situation). We were talking last night and he said "if you got pregnant now, I wouldn't be happy. I wouldn't love the baby any less. But I'd be stressed." Welp! There is a big ole possibility I am pregnant. We were NOT SAFE a few weeks back. I wont go into detail. So if I am pregnant, I dont want this to be a difficult announcement. I want him to be happy...how on earth could I tell him and make him happy about it