Why would I all of a sudden gain 5 pounds in 1 week!?

I had my surgery this past march. I have never had a plateau. Three has only been one week that I didn't lose anything, have always lost something. Suddenly, this week, I gained 5 pounds since last week! I am really upset. I can understand the plateaus, but gaining???? I was on antibiotics for a week due to bronchitis, but I dance once a week and walk a lot at my job. Can someone let me know what may be going on here? I have lost 87 and want to lose 40 more. Thanks!

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