I guess it can't hurt to talk to your doctor or midwife but as everyone says...everyone is different and the 'averages' are just that.

I'm almost 40 weeks and I have put on 21 kgs (YIKES!!!) over the whole pregnancy, starting at 65 kgs (167 cms tall). Everyone says it's all baby but I know I have fluid too because my feet, legs, hands & arms are swollen...and I'm sure there's a bit of fat there somewhere too.

As for my weight gain, by 14 weeks I'd put on 2.5 kgs, by 22 weeks I had put on 8 kgs, by week 30 I'd put on 13.5 kgs and by week 36 I'd put on 18 kgs... My stomach is MASSIVE but hopefully I'll manage to loose my weight quickly and easily enough.