Peak Fertility

Hello!

My name is Elena I am 26 years old and recently I have started using the advanced ovulation tests. 
lMy cycles typically last 25-26 days and I’ve been using a period tracking app to monitor my cycles.
 Last month I tested for ovulation on day 11 of my cycle (when the app said would be my ovulation day) and got a low fertility result. My period this month came 7 days early and I tested on day 7 (when the app said my ovulation days were starting) and got a peak fertility result. I waited the 48 hours and tested again on day 9 and got another peak fertility result. Is this usual?