Pregorexia is not a formally recognized medial diagnosis. It is a term coined by the media, public and doctors in recent years to describe the eating disorder behaviors experienced by women while pregnant, which could include intense dieting and exercise, but also binging and purging.
Celebrity media culture plays a role

It has almost become a given now in our tabloid and celebrity media-obsessed culture, said Claire Mysko, spokeswoman for the National Eating Disorders Association, that any time a celebrity is pregnant, there will be a 24/7 focus on how much weight she gains and how quickly she loses it.

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I never worried about my weight during pregnancy, I was able to exercise and lose any extra after I gave birth.

I wonder how many women do this.