That's pretty good with my first son I gained 65 lbs with my second 35lbs I'm 34+5 and I've gained about 22 lbs so far
My Dr always says 1 pounds per how many weeks you are is fine. I was right on the schedule with my daughter but thankfully this time have only gained 19 pounds by 29 weeks.
I think that sounds pretty good. They say a lb a week I think. So you're perfect!