ive been randomly weeing on these but NEVER had a positive. they are cheapo ones from ebay. last month had a few days with a faint line that coordinated with one day of egg whitey mucus, then rest of month no line at all, but faint on ov test is neg. Is it possible that im justing missing the surge? I dont test early afternoon as im out at work, have been testing mostly evening time, once a day.