Consumer finger pricks are actually less reliable than CGMs these days (relative difference of up to 25%, vs 10% for something like a Dexcom G6). That being said, a few things you can try:
1. Wait 24 hours, the CGM needs time to adjust to your body
2. Don't overcalibrate in the first 24 hours, or when sugars are in flux. You'll mess up the factory calibration which can lead to worse accuracy over the session.
3. Try a different insertion site. Behind the arm and on the abdomen are the two most common ones.
4. Talk to your endo
5. Call your CGM maker, they will almost always overnight you a replacement if it's demonstrably failing.
1. Wait 24 hours, the CGM needs time to adjust to your body
2. Don't overcalibrate in the first 24 hours, or when sugars are in flux. You'll mess up the factory calibration which can lead to worse accuracy over the session.
3. Try a different insertion site. Behind the arm and on the abdomen are the two most common ones.
4. Talk to your endo
5. Call your CGM maker, they will almost always overnight you a replacement if it's demonstrably failing.