I’ve been using two different OPK brands only because I bought a different brand and wanted to see how accurate the new ones VS the couple old packs I had left. The difference in the lines is drastic. They were both taken at 8:20 with the same urine in a dry collection cup. I have had EWCM since last night at 11 and this morning when I took the tests, but glow says it’s still negative AND that I won’t ovulate until the 14th and today is CD13. Can anyone provide some insight??