We calculate your daily ProPoints allowance and your weekly ProPoints allowance so that, when you use both, you'll create the energy deficit you need to lose weight over the week. If you eat to your allowance every day and also use your full budget every week, you?ll still be on the right side of the weight-loss equation. In other words, eat the full ?budget? of ProPoints values you?re given, and this will help you lose weight while still feeling satisfied.
However, sometimes you may decide to not use your weekly ProPoints allowance. And that's okay. Unlike your daily ProPoints allowance, using your weekly allowance is optional. If you feel satisfied by meeting your daily ProPoints allowance, it?s not mandatory to also use your weekly ProPoints allowance.
But remember: The flexibility that comes with using your weekly ProPoints allowance helps make the plan livable, and one you can stick with for the long-term. Never allowing yourself the freedom to indulge feels rigid and inflexible, and is not sustainable. So we recommend that you practice using your weekly ProPoints allowance so you learn the habit of treating yourself in a controlled way.
I have copied this from the WW website and, I admit I am wrong
You don't have to use your weekly points - they are optional.