I don't have the exact answer to your question, but want to interject a couple of points.

The test strips are fickle at best. Go up to the orange bar at the top of the page, click "Low carb Tips".. you'll find a really good article about them.

Remember, the fat fast is actually DANGEROUS for people who aren't truly metabolically resistant. You need to give your body time to adjust before considering such drastic measures. It can take time, even when following a strict induction.