Different results from different tests

Lauren

So I have been testing from cd 8 and am now on cd 20 I have been using digital clear blue tests and the cheap easy @home ovulation tests. The easy @home ones have given me a clear positive yesterday and today but I have been getting the empty circle (negative) on the clearblues.

Could the clear blue be wrong? When I eject it the test strip is super light not even close to being positive?

What are your experiences with these tests?