What was the timeframe in the movie?
How long did it take to win Jordan back after she left him on the island? When she was dancing at their wedding, her stomach was still flat.
It just seems to me that her tipping food all over him, having a relationship with the older woman, Coughlin dying, winning her back, planning a wedding then actually getting married would take some time and her stomach would have grown by the time it got to their big day.
Shoot for the moon. Even if you miss, you'll land among stars.