WOW! That's quite the little miracle you have, isn't it?
I don't have kids, but I HAVE gotten pregnant, in spite of being told by a few docs starting at age 15 that I wouldn't be able to have kids, not even get pregnant. Imagine my shock when I DID! I'd used BC for other things, and also just in case. My problem seems to be that I can't carry to term. I got pregnant accidentally when I was 26, but there were problems with that and it ended at 21 + weeks. DH and I started trying actively right after that...it's been a little over 2 years. We've had at least 2 miscarriages and 1 chem pregnancy, but we suspect more of each. The docs won't do any testing until at least one more confirmed m/c.

It's all sorts of stuff and it may be nearly impossible to correct without seriously overhauling and/or damaging my body...doesn't mean I don't think about it!
I don't think that we think you're ungrateful for your little one! Even for those of us who seem to be taking forever and would be ever-so-grateful for one, most of us want more!
Congratulations!