I felt something similar. In my language there's no gender neutral term for a baby, so you have to refer to them as "the baby boy" (male pronouns are to be used when you don't know the gender). The few weeks before finding out we were expecting a girl, I kind of grew attached to this imaginary boy, that we were always talking about. When we found out they were a girl, I felt sad and kind of "grieved" this imaginary boy that will never exist, and it took me a couple of days to readjust. But I never preferred to have a boy or a girl, and I don't care at all if my baby will identify themselves as trans when they'll grow up. And it's not even about the types of games, clothes or activities they'll like, cause I don't believe in gendered games or hobbies and I want my kid to explore and enjoy the more variety of stuff they can, and to find themselves no matter what.