Sounds like you might be ovulating....and if that's the case you should expect to start 12-16 days from now. Usually though in the case of ovulation, you feel the cramp more distinctly on one side or the other.
Have you spoken with a doctor about your lack of period? There are a variety of things that can cause a women to stop her menstruation... it's important to discover which of those things applies in your case. Abnormal menstrual health is not something to be taken lightly.