Why don't you give it a few days and think it thru. Why don't you want more children? Think about the reasons, and then bring them up after you thought them through. Talk to him openly about it, maybe start by saying "I really need a few days to think about if I want to have another child." Be loving and patient, he sounds like a great husband! You're very blessed! Good luck with your decision, and let us know how things go.