There is something wrong with a society when the best way for a married couple--each of whom works full-time and has two children--to afford a house is for one of them to open their womb for rent.
I am so glad you made it through the pregnancy with what sounds like your health intact. My only concern about surrogacy is the mother, and who she might leave behind if the pregnancy goes sour.
This story has a happy ending for your family, but the reality is, if something had gone wrong, it would have been your family's life that was upended, and for anyone to think you should take a risk like that for no compensation is vile.