I have put on 5 kg and I am 35 weeks pregnant. I had extra weight on so could afford to not put too much on, I have been concious about the amount I have been eating though.

Due to just being pregnant, you will probably feel heavier even if you havnt put on much weight. Dont worry too much.

FWIW, my midwife weighed me at my booking in appointment and hasnt weighed me since. I just dont think its as important as it was once thought to be.