Clomid and the Clear Blue Easy Monitor

Hi, I could use some advice from anyone who has taken Clomid and used the Clear Blue Easy Monitor to track ovulation.  I have PCOS and have been on Clomid for 4 cycles now (5 if you count the first unsecessful one).  On the first 1st cycle, I had several days of high results but did get a peak result on day 17 and my dr confirmed ovulation.  The 2nd cycle stayed on high for almost 2 weeks and never gave me a peak but a blood test confirmed it did happen.  The 3rd cycle gave another peak result on day 17.  I'm on the 4th cycle right now and again I didn't get a peak when I expected to.  The odd part is that I'm on day 26 and I'm still getting a high reading.  Has anyone had a similar experience?