Clearblue Advanced OKT - Faulty!?

Rebecca

So for the last 3 cycles I have been using Clearblue Advanced Ovulation kits. These tests were telling me I was ovulating on approx day 21 (the the first and second cycles tested), and on the third and current cycle I’m on day 23 (high fertility flashing face) and expecting to ovulate tomorrow based on results. However I had an appointment 2 days ago with a fertility doctor who thought that sounded strange as my luteal phase would only been 6-7 days long (way too short to fall pregnant). Anyhow, she did a blood test and said the results show I 100% ovulated at least a week ago!!! I have been testing on this cycle everyday since day 11 and am currently on day 23 with no sign of ovulation. These tests have got it so completely wrong!!! Has anyone else experienced this!?