Mine all tend to sit around 39C - so it's a little bit low, but I wouldn't panic just yet.
If she was hypothermic you'd see shivering and she'd seem 'off'.
Does she seem well in herself ?
Has the constipation eased ?
Is her straw bed damp at all ?
I'd top up her bed, get a feed into her and take it again. If you have any electrolites (get them at your local agri store) try mixing that with her water to help re-hydrate her.
If you've got a heat lamp for farrowing I'd plug it in for her now - she might have got chilled during the move
But a phonecall to the vet doesn't cost anything
HTH
Karen