gaining more weight and eating less?

J
I was eating 2 lunch and dinners during the 2nd trimester steadily gaining 1 lb a week. Now at 32 weeks my appetite has diminished. I'm eating a normal three meals a day and I'm gaining more than I was before. I've gain 2.5 lbs last week and this week. This happeneing to else? Maybe water weight because it's so hot?