I think it is too soon to be concerned yet, especially when you have been ill. Weight loss won't always be linear, even when you are doing everything 'right'. Please don't let one week when the scale isn't showing loss derail you. I'm aiming for a 1.5 pound loss per week. I haven't seen that every week, but if I look at the last month, I've averaged 1.6 pounds/week.

Have you started a new workout routine? Or do you have sore muscles? For me whenever I do that, I don't see the loss until the muscle soreness has gone.

A few years ago when I was training for a marathon, the coach used to tell us not to freak if we gained a couple of pounds after our long run days. She said our bodies will retain some water weight during the repair time. It seemed to be true for me. I'd always be up a few pounds for a couple of days after runs that were 14+ miles.

Now I notice whenever I start a new routine that leaves me sore, my weight will stall for several days, then I'll have a quick drop.