Trivia: Erin Vanderbilt, the woman that Andrew is shown marrying at the end originally had a bigger part, but test audiences misunderstood her relationship with Andrew before breaking up with Melanie, so all of Erin's scenes were cut except for that small bit over the credits.
Trivia: During the film's original outdoor reception Jake carries Melanie, who feigns death after having supposedly been struck by a lightening bolt, towards the wedding guests. Jake announces, "Melanie Carmichael is dead" but then a few seconds later he says, "Long live Felony Melanie." Jake and Melanie do this as a practical joke. The reaction of Melanie's mother at the supposed death of her daughter apparently upset the test audiences so much, that the production crew reshot the whole reception scene, minus the practical joke.
Answer: She had a miscarriage.
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