There's a bit when she first hugs Pete at night and her belly looks round (not fat). As the film progressed, it looked as if she were getting slightly bigger. I also thought there were a few scenes where they deliberately masked her bump. Notice also, they don't show her crawling through the back window of Jack's pick-up near the end.
Was she pregnant?
No, she wasn't pregnant. I thought so as well. She's actually just super curvy now, or maybe she always was? :) She always seemed quite slender in her previous roles, but if you just search around for more recent pics (like awards shows), you'll see she just had amazing costumers in the past.
shareI read interviews where she explains she just doesn't care that much about being super slender in everyday life, but she's able to lose weight very quickly if the role requires it. He did it for Jurassic World (where she was very fit indeed and there was no costume trick for that), she says she's going to do it again for the sequel. I guess she's still young enough to be able to pull it off.
shareI thought the same. Looked like her outfits were purposely hiding her belly.
share