I don't intend to share my menarche story in this thread, but I don't think ANY modern cartoon has really encapsulated the feeling of getting your first period. The only media I've seen that 100% honest-to-god
gets it is
Aisle 8A, that episode of King of the Hill where Connie gets hers. Everyone around you acts weird, you don't want to run and play like a kid but you're definitely not a "woman" now, because you're still a literal child. It's awkward and uncomfortable but after a few days the crisis slows and everything will be okay. The way Bobby and Connie reconcile at the end of the episode is precious and funny, and honestly that's probably one of my top KOTH episodes.