There have been plenty of times when I've had no weekly loss, or even gains. It's important to look at things in the long term, I think, and take stock of what you've managed to acheive so far. Mixing up your exercise routine is a good thing, but don't beat yourself up for not having had a loss.
I'm Tealeaf, and I approve of this message.
My weight loss site, with blog, before and after pics, recipes, tips, charts, and stuff. Annie Takes Off