When my husband & I got married we discussed children. Personally, I have/had no desire to be pregnant. After a several year debate, I decided that I would rather rent my body to my children for 9 months prior to transition than have to spend their entire college fund on surrogates, etc or adoption down the road.
We have 2 daughters, 1 year & 1 week apart. That was the most miserable 2 years of my life. I felt like hell. Felt like I was trapped in someone else's body more so than ever before. There were many days near the end of each pregnancy where I'd wake up each morning wishing to either *pop* or die. Would I have made it through that time without my spouse's support? Highly unlikely. Truth be told, if I had done it alone I likely would have suicide(d) out. I don't regret having created my girls, though.
Do I wish I could have created them using my own sperm & let someone else lug them around during gestation? You betcha! Am I dreading explaining to them later in life that while Daddy & Daddy are gay, one of their Daddies used to be *Mommy*? You betcha!
I guess my point is, no matter which path you choose there is always something to be unhappy about. Just like there is always something to be greatful for.