It's easy to say don't worry, I have been going to weight watchers for 2 months, and only last week was the first time I was not nervous about my weigh in. Every other time I have been pooping it to say the least.
The way I look at it is, that weight watchers for me, is a long road, and it's not always gonna be an easy one, but I will make it to the end in my own time, and over the course of the journey I might take a wrong turn but I will find my way again. Hahahah what a speech!!
You have been ill, so IF you put on then you will know why you did, next week you can get back on it.