Whoa! Hold up there!

Okay you say you are sick and taking antibiotics. Running a fever? Drinking lots of fluids I take it, like the doctor recommends?

If you are using the Ketostix it could be the antibiotics are effecting their turn color and the 3 pounds you "gained" is just water retention and will flush out once you are no longer sick. Body tends to retain water if running a fever.

Stick with your eating plans, wait out your illness before jumping to conclusions that you are doing something wrong.

I hope you get to feeling better soon and find that the weigh gain is only temporary due to being ill.