That's Wonderful News!
I was pregnant with my first and only at 38...I like being an "older mom" too.
I wish someone had reminded me (often) that I was NOT eating for two, as a pregnant woman. No, I was eating for me and a baby, who is going to subsist on 4-8 oz of liquid every two hours (total 96 oz), the first few weeks after he or she is born and not a whole lot more after that...and by the way, that kiddo will be doubling in size that first year, too.
IF I had kept THAT in mind, perhaps I wouldn't have come so close to doubling in size myself.
If I had thought to eat like a "healthy" woman, then I'd have done a lot better...
But I have to admit - I loved being prenant and I love being a mom...
Enjoy.