Relle, I don't think children ever stop being a "handful"! Well, maybe in their 30s at some point, but not any time soon! Do it now, if that's what you and your DH want, and you'll deal with problems if they arise - just as you would do with if you only had the two.

Having known the stress and upset being able to think of nothing but TTC causes when you can't (actually, that is nothing compared to pg hormones), it's not worth putting yourself through all that upset when you're having any other stress in your life.