Gained 5 pounds in a week..

I am 7 month pp and am an exclusive pumper. I weighed 149 before getting pregnant, went up to 163 and then by 4 months pp I was down to 140-142 depending on the day. About a week ago I noticed I was retaining more water and everyday I’ve gained a little bit on the scale. I’ve had no change in diet (2 weeks ago I know I ate more and less healthy over Memorial Day weekend), I drink plenty of water because I’m an exclusive pumper. What gives? I can’t cut calories because I don’t want my supply affected, but I honestly feel soooo bloated!