Tesco test false positives ?

[JD96]

I have recently taken test from Tesco which have came back very very faint crosses (positive), however I have done clear blue, boots test which say negative? Has anyone ever experienced anything similar to this ?

What are the sensitivities of the test? Did you do all of them with the same urine sample?

I’m sure they are either 15 or 20, no I did the one test about 2 weeks ago at the night, the next one was in the morning, most recent one was Tuesday morning. But all other brands are negative. Still no period