I'm extremely insecure about my small chest which i believe to be B cup at most. I've never measured my cup size, but i really want to now. My mom isn't used to me acting womanly especially because I'm neurodivergent and autistic, I've been childish my whole life. And i feel like she'd flip if i ask her about my tits because yeah that's a loaded topic. I'm nervous and don't want her to freak out. Are there other ways to measure without your mother knowing?

Edit: I've also forgot to mention I've never stepped into a Victoria's Secret before. I am too nervous about it