Clear blue ovulation test

susan

I am 6 days passed my period and started to test for ovulation yesterday and it was a blank circle and today it as the flashing face. But I am according to the app not supposed to be in my fertility window till the 19th in 3 more days. My peak ovulation is supposed to be the 24th. The testing holder is the one I used last month can it be reading wrong. Is it normal to be fertile this soon ?