Excessive weight gain

Has anyone suddenly started gaining a ton at the end of pregnancy? I've hardly gained at all the entire pregnancy, which my midwife hasn't been concerned with as I was a bit overweight to begin with. All of a sudden at 34 ish weeks I started packing on the weight. I'm talking about 5 pounds in the last 2 weeks when I had been gaining half a pound, if that, every 2. I'm not worried about the weight itself, just how quickly I'm gaining it. Ive read that 2+ pounds a week is cause for concern but other places say it's normal so someone tell me your experiences!