Thanks for the query.
it will take some time for regularization of periods.
Generally 28+/- 7 days menstrual cycle is considered normal. And 2 to 3 days deviation form the expected date is normal.
Sometimes woman may have bleeding on days of menstruation
even being pregnant, so better to go for pregnancy
If that comes negative, consult your gynecologist.
By undergoing physical examination and ultrasound
you may find out the cause for your problem and treatment can be taken accordingly.