Opk's.. Fertile window.

Here's my question. Last month I had close to 6 days of blinky smileys on my opk's and then finally on CD 16 got my solid smiley. Today started my fertile window according to glow. I took a opk and it was the empty Circe. Do you think this month I will just get the normal two to three flashing smiley or will your body do as last month and give me 7 days of them?! If I do ovulate on CD 16 again that puts me at this Saturday. Am I being imaptient? Lol