I need help... I think

So I’ve been in a relationship with a female (who prefers to be male (transgender)) and he’s asked me to marry him (now I love him a lot with all my heart and his family loves me) but the dilemma for me is I want kids someday and even if he does the whole transition from female to male that’s going to cost thousands there’s still a chance of infertility. And I know you can adopt but I actually want to experience pregnancy (and even with a sperm donor it’ll still cost money, something we don’t have a lot of) Please no judgement I just need advice. if someone else is in the same situation how are you making it work?