Clear Blue digital ovulation tests

Brittany
Okay ladies, My husband and I have been ttc our rainbow baby for 3 years. I took the plunge today and threw out my ovulation strip tests because I'm so tired of the confusion. I took a clear blue digital test today and it came up low fertility. My average cycle is 27-29 days and I would be cd12. Has this ever happened to anyone and they got a positive after continuing to test? Also, what is the best time to use these tests?