Just so you guys know, (coming from the opposite perspective of course,) I was exclusively using the stalls to pee in the men's room during the entire time during transition that I was still presenting as male publicly. And I was still doing it even beyond the point where I stopped passing as male consistently, and many people were gendering me female even when I was dressed in male clothes. And seriously, despite that, despite being gendered female by people, despite always using the stalls, and despite wearing panties that were probably clearly visible under the stall door where anyone could see them for crying out loud, nobody ever cared, and not a single person ever questioned me on it. That is how little guys care about each-others' bathroom habits.
So my advice is just to chillax and don't worry about it so much.