One of the normal, expected side effects of hormonal contraception is a delay in the return of ovulation. It may take some time to re-establish ovulation after coming off birth control pills (up to two year). You may also have irregular periods or no periods at all (amenorrhea). These conditions are caused by a lack of ovulation. Ovulation is usually established 6 months after ceasing consumption of the pills... but the maximum waiting period is 2 years. In your case, the most important thing is to find out if you are ovulating, or not. A Pap-test can not determine that. Hormonal analyses (FSH, LH, estrogen, progesterone) and an ultrasound have to be done. Vitamins have no connection with ovulation. If necessary, ovulation stimulators (clomifen) will be recommended. You can go to a gynecologist for these follow up examinations and to more closely monitor your fertile cycle.