I just tested it real quick if you could get pregnant from gonzo as well. Wasn't that far in the game yet to begin with.

Defeated the goblin and started the scenes with the doc. You don't actually get pregnant from him.
So taking your post into account I believe for the first part of the game it's actually only the goblin you can get pregnant with.
Hmm...feels kinda limiting ngl. I thought we have a whole mechanic to play around with but it's all heavily scripted.
I mean I take it don't get me wrong. There are very little games with actual pregnant content out there to begin with (pregnant sex, pregnant belly CGs, birth ect.) but looking at the menus and seeing that pregnancys are recorded and counted I got the assumption that we have a actual free scenario mechanic (like getting pregnant how often you want) on our hands but it's all just a placebo xD