Clomid and no ovulation

I'd started clomid on cd3 and completed the last dose on May 2nd, and still haven't ovulated. I was advised by my doc to take it to help after my TR, but I ovulated last month (used a test). I had taken my opk everyday from Friday until yesterday with no spike. Checking my cm and it's changed along with position, but still nothing. Has anyone else experienced this? If I do not conceive this month on it or ovulate; I don't think I'll take it again; due to how I felt on it.