Not on my weigh in day!
This is so maddening, and seems like something many of us have to deal with. Yesterday I reached "normal" BMI/weight (yay!) and today am up over again, and it's because I'm constipated.
Weight is going to fluctuate and that's one reason why. I hope your medical advisor has some good advice for you and this isn't going to cause a problem.
Most of us will have this problem from time to time and you will see your weight fluctuate due to many different reasons. I take Miralax every morning now in my Crystal light and then follow with water all day long. It took 4 days to kick in but now I am having no constipation problems. Target and Walmart have their own generic equivalents also. Miralax costs about $17 for 30 doses where I live.
The scale can be our worst enemy...hang in there it will come back around and again be your friend!