The feast is of more import than the wedding itself. By the sounds of it, you may need a...distraction. Congratulations are in order for the pregnancy, albeit the nature of such goes beyond the extraordinary.
I've not heard many tales of mortals being so afflicted. But there is lore regarding other races who have, let us say, accepted elemental aspects into themselves in such a manner? Thus the reason there are Light Elves, Dark Elves, Frost and Fire Giants, so on and so forth. If you wish to keep the child, that will complicate matters.
I would need speak with some of elder mages of Alfheim.