Why did I suddenly put on weight again?

Literally overnight ( well actually over 3-5 days) My breasts have gone back to their size they were when I was in my teens (12DD), I was a 12C a few days ago, and I did have a toned stomach that's going and I don't know why... And I exersize and I eat well- I haven't done the "wild thing" since January and I'm on the pill so I know I'm not pregnant...

HELP PLEASE people WHATS HAPPENIG TO ME
Why did I suddenly put on weight again?
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