So, I bought both the Clearblue Digital and First Response ovulation tests. Yes, crazy. I got a solid smiley almost 3 days ago on the digital. I've been testing for 3 days now and the First Responses have all stayed positive. But after it went blank, I just took the digital again and it is back to empty circle. Have I already ovulated, or just about to? The last First Response one that I just took looks the darkest of all compared to the control line.