I have been taking these Clearblue ovulation tests the past week. I never got a high fertility, in fact all I've gotten is low fertility, a black empty circle. Tonight on a whim, I took this one and it's blinking a smiley. Has anyone had any experience with this? My period is due in 8 days, could I ovulate this late in my cycle? I could have sworn I already ovulated prior to beginning with these tests! According to Glow I ovulated over a week ago. Any advice would be great!