http://www.fin.org/mqa_bcp_fertile.html

The earlier oral contraceptives had a lot more estrogen in them and it was not unusual for women to take six months to a year to start having periods. The newer pills with 35 mcg of ethinyl estradiol have a much shorter "kick in" period after stopping the pills. The oral contraceptives with 50 mcg of ethinyl estradiol are associated with a longer time for normal menstruation to resume. Just hold on. It will happen. Good luck. Namaste. Dr. JJ