I'm so confused. ovulation tests were high yesterday and the day before, but AF came this morning. I…

I'm so confused. ovulation tests were high yesterday and the day before, but AF came this morning. I was confused when the tests showed as high to begin with. Based on my cm and other symptoms i ovulated at the end of last month. Could they have both been wrong? But then again I started having egg white cm again an now AF. Could I have ovulated twice? this is my fist cycle since stopping BC.