Is a really increased appetite normal?

Chloe • "What a treacherous thing to believe that a person is more than a person." - Quentin Jacobsen
So I'm a little thing. I'm 5'3 and only like 95 lbs. But lately, I don't know if it's just because of my period or what, I've been eating a crapload. I ate a whole large flatbread pizza and mnm's and chocolate and caramel and a pretzel stick yesterday and today, and I was always hungry when I was at my friend's house a few days ago. I got my period last Sunday, and it's over now, but I'm still eating like a pig. Usually I just eat smaller portions really often, not whole pizzas for the whole day!! Is this normal? It hasn't happened before