I just wanted to say that I've been tracking my own weight, but my OB has not weighed me at all - not even once. I actually asked him about weight gain and he said that weight gain/loss during PG is really of little consequence - the main thing is that the baby is growing at the appropriate rate and that you are otherwise healthy.

I think personally weight gain etc can be a little deceiving during PG if you're going to retain a lot of fluid as I have been - you should see my ankles etc! I've gained my fair share so far (and was already carrying additional pre-PG weight) and it has really bothered me, but the OB did mention to me that most of it was just fluid.