Why is my appetite so huge recently?

First off: sorry if it's in the wrong place. I've always had an appetite but recently i feel if my stomach is bottomless. I had three tacos and a honey peanutbutter sandwich like 5 minutes ago... But I Feel like I haven't eaten ALL WEEK! And for some reason.. (Probably unrelated) my period is 21 days late and I still haven't had it... If you think you know why or just have opinions.. Please comment.
Why is my appetite so huge recently?
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