I went 5 months with out a period last year. Are you sure you O'd? I never did and had to get provera to jumpstart AF again. Either way I would at least give your doctor a call and find out what he/she thinks.
You can still get your period whether you O'd or not, it's referred to as a anovulatory cycle. You should definitely see your doctor, a lot of things can cause a missed cycle or two, but you should have it checked.
I would definantly see a dr!
Make an ovulation ticker