Speaking as shitlord, I'll jump in and say that you get a LOT of leeway when you're pregnant and for a few months after.  And, as long as you don't think like an obeast and extend that to absurdity, it's probably pretty damn attractive.  Sure, keep it reasonable and get back to normal soon enough, but growing the baby is the priority and it's better to be a little over-nourished than under.