Too much weight gain in second trimester?

Katherine
I just came back from my doctor, and forst it was an issue that i hadnt gained any weight uo until about two months ago, then i gained some weight and within the last month i gained 5 pounds. For being only 26 weeks, she said that is wayyyyy too much to be gaining in a month. Should i be concerned? How do i control my weight if i already eat so little due to sickness?