It sounds JUST a WEE bit like you want to be talked into a yes, or wonder how to talk your husband into "Yeah, woman, what are we waiting for?"
I won't talk you into it, because I have had very serious concerns since I came of age in the 60's about the climbing human birth rate. As a species, we humans have done a pretty amazing job of putting other species and future generations of humans at risk. Every baby adds to the burden – especially in the West, where each child consumes four times or more of the natural resources of a baby in an undeveloped country. Imagine the strain on the earth when every child born in the last 10 years in developed nations wants a home, a refrigerator, a washing machine, a laptop and television (not to mention a bazillion other products)? And then wants/needs to replace them with "newer, better, bigger" every 1-20 years? What about the 2 or more kids per family they are likely to produce?
I stopped with one child for the good of all future children. My one daughter now has an awesome little boy, and has decided to stop with him. Babies are so wonderful, so rewarding, so lovable, it's natural to want more (I sometimes even wish for another grandchild). In fact, nature has programmed that desire into women for the ongoing success of humanity. But we have simply become too successful now, trashing the garden of life we depend upon.
For the love of your own grandchildren (and you will adore them!), I hope you will choose to be content with the replacement number you've already produced. Contentment is a state of mind, and the state of our minds is partly rational.