Thanks for the query.
When one takes a birth control pack of 21 pills without a break free days of 7 days, then the periods will not occur, on stopping the pills, one may get cycles called withdrawal bleeding. In case you have done the above taking it continuously, the missing of the cycles is justified. If not, some birth control may produce sudden changes in hormones which can commonly cause a delay or missed period. In all ways, do a pregnancy test in case your sexually active to rule out a pregnancy.
Hope this helped.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.