For 6 weeks now I've had the same traditional bra that I've worn every single day, as it is the only one that I own.
Is it because you're unsure about your gender identity or something else?
I don't think I need to own more bras as I consider myself a boy. In fact, I don't even want to dress in women's clothings.
I understand you're uncertain about your gender so you dont want to have more bras. But if you're wearing one now, you should keep it clean as it may cause harm to your health.
I'm a boy and it's fine. People need to stop policing my gender expression.
While you don't need anyone telling you who or what you are, what people can tell you is that it is unhygienic to only wear one bra that you never wash. At the very least, wash it. Even if its the only bra you like.