Dear T. - Bless your heart! I fully understand how you're feeling, wanting to have another baby but not sure. It's clear that you are physically able to, so that's not an issue. But as a person who has lived long enough to see a wider perspective, my suggestion to you would be that you can live a wonderful, rich, full life with your two children and you will be very happy! The years between birth and age 8 are technically Early Childhood, and they're often referred to as the Golden Years, because children are so adorable, growing and learning so fast, and doing and saying cute things all the time. But as children grow, they're still lovable, of course, and cute and funny and smart, but their little problems become bigger, and it takes much more energy to handle their everyday lives. Then there are the teen years - start gearing up for that now! LOL
The point is, you have a perfect little family now, and I doubt you would ever yearn for another child 5 or 10 years from now.
One other thing to consider, and not to be negative, but having a healthy child is not a given. These days, there are many things that can go wrong, both before and after birth. This is just another reason to be VERY thankful for the two bright, healthy children you already have.
And in the broad perspective that comes with age, I have learned that we can be content with the blessings we have now, and not gamble on anything more.
This is just one more opinion you can put in the mix as you make your decision.
My best to you!