What do I do

Naeemah
So I'm engaged and I have fertility problems but I really want a baby but I know me and my fiancée aren't ready for a child now. I want to say something but I'm kind of afraid of the rejection even though I know it's coming. I also feel bad because eventually he's going to want children and I'm afraid I won't be able to give him any. I had a previous fiancée who actually left me because of that reason. I'm scared what should I do.