help from experienced clomid users

Last month my dr. started me on 50 mg of clomid, which was unsuccessful in triggering ovulation. This month he bumped me up to 100 mg, but I am on cd 24 and still no sign of ovulation. He told me to try 100 mg for one for month and if that doesn't work, I have to meet with him for another consultation. Has anyone been in a similar situation. Has anyone ovulated on the second round of the same dosage that didn't initially work? What is the next step if I don't ovulate next month? Any feedback would be greatly appreciated. I am getting very stressed and nervous. Thanks.