Really though, you could just take the most direct approach and just tell her your feelings!
Really though, you could just take the most direct approach and just tell her your feelings! Take a deep breath, walk up to her and say something like, "This is really embarrassing, but I need to talk to you about my first period." She might be surprised, but your mom can get to the point right away — and she’ll probably do her best to make the conversation as painless as possible.