Board Thread:Character Discussion/@comment-1170080-20150424105134/@comment-25926288-20150424113507

You have it a little backwards, but great theory. Going with your theory, Mal used the unicorn to reveal the future of her child. Once, she saw the future, she actively tried to prevent it by joining up with Snow and David to prevent the Dark Curse that would separate her child and herself. Unfortunately for her the Dark Curse isn't what separated her, but the Apprentice's powerful spell that send her to another world.

Regina's fight with Mal over the Dark Curse happened while she was pregnant and before she wen to Snow and David after their honeymoon.