I put on a whopping 30kgs during my pregnancy (I ate like an idiot, though). Probably 80% of the weight I gained during my middle trimester.

I lost 10kgs in the first week after the birth, though - just bub, fluid etc. The rest I have had to diet off and still have another 10kgs to go.

Your weight gain sounds normal to me and just remember that you can gain a heap of fluid in the last couple of weeks - which you will lose very quickly after bub arrives.