CB Advanced ovulation accurate??

So I bought the clear blue advanced ovulation tester kit, I’ve had Atleast 6 days in a row of “high” fertile days and still no peak? When I look at the lines of the insert, when I pull it out, the lines don’t look like they’d be considered “high” but the ink does leak kinda bad shortly after. I had a mc last month on July 16th. I still haven’t had a period yet, so my question is, is this accurate? Ovulating over a month later? I am having a few minor cramps that started yesterday.