No. Pregnancy exacerbates my existing blood sugar problems, and I’m not putting my body through that for a child that’s not my own, not to mention I’m not sure I could deal with the emotional aftermath of giving away a child I’d carried for 9 months. Egg donation is out, too. The idea of a small person who genetically and possibly physically somewhat resembles me is just too squicky. (Although this is a moot question as my eggs are undesirable for such purposes anyway, due to aforementioned blood sugar problems.)
Seems pretty one-sided so far.
Well, Quartz, I put my daughter up for adoption when I was in my early twenties, so technically, I did although not to your OP’s specifications. 
Would I do it again? I’m honestly not sure. It would depend on the circumstances.