After a couple decides to tie the knot and gets married, the next step is usually kids. But how do couples know they are ready to have children? It seems like such a scary decision, and it's so life-changing, that you have to be 100% sure you are ready for it, but is anyone ever 100% sure about anything? My husband and I have been married for almost 4 years, and only now we are starting to feel slightly ready to discuss kids, which means we are having deep conversations about our plans for the…