after stopping the pill the time taken for recurring of ovulation and menstruation
will deffer from person to person,
usually you will have withdrawal bleeding while on pills,
now the cause for your delayed periods could be hormonal imbalance or pregnancy
so you once consult gynecologist and undergo blood test
for pregnancy which will rule out that possibility, then if comes negative you can undergo physical examination and ultrasound
to find out the cause for your problem.