so many people who think of adoption as such a blessing have never looked into the whole process. as a trans person, it's not all that likely you qualify at all (unless you'll choose to adopt a special needs child, where it seems authorities won't be too "choosy"). So that leaves you with adopting a special needs child, where the process is comparably cheap, but your other expenses may be really high. Or foreign adoption, and we're talking tens of thousands here.
Now I'm just waiting for someone to say if you can't afford 30000 for an adoption or can't afford making your home barrier-free, you're not fit to be a parent...
It's a good thing it's everyone's own decision and you can choose what's right for you. I just don't like the taste of the phrase "my girlfriend knocked up by another guy". That kinda reeks of marking imaginary territory to me....and making others feel bad because they do choose a donor.