Yes, it's normal. I only gained 30 by my ninth month, and it sped up towards the end.
As long as you have a good diet and your OB is ok with it then you're fine. I only gain 23lb the whole 9 months. My baby girl was born 6lb 10oz and perfectly healthy. Just make sure you take your prenatal vitmines :)
Depends on you. I'm 30 wks and have gained 3.2lbs.