Husband doesn't want another child

I definitely don't think you should deceive him! That could backfire terribly for you, him and the child you already have. 

Your current child is still very young so maybe he feels it is too soon! I understand your need to have another child but if you can wait, even for just a few more years, his opinion may change. 

Either way I'm sorry his decisions is causing you pain and I hope you find a resolution that pleases you both eventually.