It's only been 4 weeks

my baby boy passed away. my husband wants me to go get my birth control taken out because he wants to have another baby. I totally understand his urge but I also know it won't help anything. We can't replace our boy. It's hard to say no but I do. I tell him I'm not ready. though apart of me wants to so I can hold a baby again and breastfeed. I'm scared I may never feel ready. I don't want to take that away from my husband or my 3 other boys. my oldest has told me he wants me to have another baby too. I can't help but run this in my head and wonder will I ever feel ready? and if I do how long is long enough to wait?