Q: I see a faint line in the OPK test window. Is that positive and does that mean I will ovulate soon?
A: Contrary to a pregnancy test a faint OPK line is not a positive line. You need to compare the test line with the control line. A test line in the OPK that's fainter in the test window than the control window does not mean you are going to ovulate. Unlike home pregnancy tests where any line in the result window indicates a positive, OPKs are only positive if the test-result line is the same color or darker than the reference line. You should read the manufacturer's instructions to verify if a positive means that it's the same or darker than the control window.