Clear Blue Issues?

My app says I typically ovulate around CD14. (I know the apps are just guessing) BUT I had some cramps/left pelvic pains and CM around CD14/15.. but the clear blue advance digital was only a flashing smiley face. I finally got a solid smiley on CD19, but what about the CM and cramps from before? Has anyone had an issue like this? Did I really not ovulate until CD19, or did CB miss my peak, and maybe it just spiked back up later on?? Idk. I'm confused!!