Audax,

I had to ask my doc to weigh me because he hadn't and says that there is no need.
I wouldn't be surprised if i've lost weight recently as I haven't been as hungry in the 3rd trimester. Is this the same for you? Do you find you're eating less now?
I don't think there is any need to worry so long as you are eating a well balanced diet.
Why don't you give your doc a call and just see what they say.