I get a pale line.

The ovulation test detects a peak, that is, a sudden increase in luteinizing hormone LH preceding ovulation. This serves to determine the optimal time for intercourse and conception of a child. The result of such a test should be read in accordance with the instructions attached by the manufacturer, generally within a few minutes. After that, it is no longer reliable and should not be taken into account. You have collected a lot of tests and given information that you have been testing since March 8, so perhaps some of the tests presented are from a few days ago. Such tests can no longer be interpreted, they should be discarded after execution. Unlike pregnancy tests, the ovulation test should also not be performed from the first morning urine, and about 2 hours before the examination, it is recommended to limit fluid intake. Otherwise, the result may be a false positive. A positive test result is evidenced by two distinct stripes, or the color of the line in the result field (test line) is stronger. A negative result is evidenced by the absence of a stripe of the result (test line) or its poor coloration. You can read more about pregnancy and ovulation tests here: https://www.gdziepolek.pl/kategorie/test-ciazowy