Two days solid smiley faces then next day nothing

Heather • Nursing student, raising two beautiful boys and have a loving hubby! I`m the queen of my own castle!
Is this normal I have two days of positive opk. I have the clear blue digital and I just had two solid smiley faces see pic 
And then the third day I tested that was yesterday and then today I had a zero. No smiley face. I think I ovulated yesterday because I had cramping on one side. Is that normal???