I am a new opk user and was wondering how many times a day do u test. My cycles average about every 42 days and I am not sure when I O. I started using opk this cycle and the all were neg until CD21 or Cd22 they were the same color but if I go back and look at them now they are all the same color. So just really confused now. I ordered internet cheapies guess that was not a good idea for first time user. Any advice??????