Since my miscarrage in october i haven't been ovulating. why?

Stress: If you were ovulating and having regular periods prior to your miscarriage then it is likely your stress level that has altered your ovulation. This will usually return to normal given some time. If you had a d;c for your miscarriage this, rarely, can cause scarring within the uterus. You could still be ovulating but won't have any period bleeding - or only scant amounts.