I totally relate.
I go out of my way to casually (well, making it sound casual, while my tummy’s doing butterflies) mention “my ex-girlfriend” or some other “I’M BI!” clue in talking to my mom friends.
Firstly, to weed out anybody’d who’d have a problem.
Secondly, so if they’re bi too, they’ll feel comfortable talking to me about that part of themselves (or about sex/pre-mom stuff in general).
Thirdly, just so it doesn’t come out later on accident.
I never imagined I would have to come out so many times.