Af usually comes around the 7th of the month. I've been tracking my cycle and last week and into the weekend I was in my fertile window. I know my body well and can tell when my body is ovulating. I get the egg white consistency cm and I get the tights cramping. I figured I was done ovulating and then out of curiosity decided to take an opk and it showed I would be ovulating in the next 24-36. I'm not sure what to think. Can I have those symptoms and not ovulate at the time? Could the opk be off?