Wanting more baby

I want another baby in the future. Not right now I have 4 children and am in nursing school. I am 25 years old, and in nursing school. I want to get out of nursing school and I have the mirena so I am not trying. But my fiance who is the father of all my children says he is done having babies but I dont know how to say I want another later in life. He is talking about getting snipped and I said dont worry about it I have the mirena and I have 5 years to get my tubes tied later. He is so against having another baby but I'm not saying right this moment for sure waiting like 3 years. But I think I do. I dont think he will get snipped right now because I have the mirena but I want to bring up the fact maybe I will want another in the future. I kind of just want the option open maybe I will change my mind but maybe I wont I dont want to look back and wish i had another child.