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I TOTALLY think Jen just ate a few extra pretzels and sipped a bit too much SmartWater, but somebody here in the office swears she must be pregnant!

So, the theory goes ... the couple broke up mid-August but John could have planted his seed just before then ... that would mean Aniston could be two and a half months pregnant and just realizing it! Hence, the reunion that reignited the couple's relationship just two weeks ago ... "Hey, John ... yeah, things are good with me; how about you? Cool ... oh, by the way, I'm pregnant ..."

Is that even possible at all???!!!! The mags were hot for this story a week ago after our first set of pix in which Aniston sported a tiny lump on her belly.

But like I said, 100% NO, in my opinion. What do YOU think?