High fertility days

So this is my first cycle consistently using ovulation tests. I would do it for a day or two in other cycles and then forget about it. How many high fertility days do women usually have before their peak? I read somewhere that about 30% have between 4 and 5 and then the percentage got lower as the number of days got lower. Then I read about how some women domt register peak days either to low levels of the hormone or because they didnt ovulate that cycle and of course I became paranoid. I'm on day 4 of high fertility and was just wondering the number of days you ladies had. My cycle usually lasts about 27 days and I'm on day 14 so I'm starting to worry I may not ovulate this cycle.