Could I be retaining water?

I am getting a little worried. I am almost 5 weeks post-op. I have been doing pretty good with my water in take for about a week now. Yesterday I got in 72 oz., all water, plus about 8 oz. of Crystal Light. I went for a walk lastnight. When I got home I sat down with my water bottle and drank the whole 32 oz. in about 30 minutes. My dad and husband were teasing me saying I would be up all night going to the bathroom. I wasn't. I went about 11:30pm, then not again until 6:30am. And during the day I am lucky if I go three times before bedtime. Shouldn't I be going more since I am drinking so much? Should I be worried about this and call my PCP? I have also noticed my weight jumping around the scale. One day I am down 2 lbs., the next day I have gained 4 lbs. Could this be from water retention? I appriciate any advice you can give me.

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