If you're deciding between eating a pint of Ben & Jerry's ice cream versus a WW bar, stick with the WW bar. The low-cal "fake" sweet stuff helps keep me on track in other areas, so even if the processed stuff isn't as good for you as whole foods, I'm still going to eat it if it helps make me feel satisfied. You know? Eventually I plan to take it all out of my diet but I'm not at that stage yet. Little things at a time.
I doubt the lack of weight loss is related WW products. There are millions of processes in our bodies that we can't even begin to comprehend, none of which we can control, any of which may be to blame for things like stalled weight loss. It hasn't been long enough for you to be concerned about not losing, if it's barely been two weeks. You have to be patient, and get used to the idea that you may not see a loss every week! If you're on plan, doing everything right for your body, TRUST that the scale will eventually catch up. It will. You just have to stick with it!