It is likely that you are experiencing a hormonal
disturbance due to irregular usage of the pills. you have a delayed period most probably due to the hormonal imbalance. Your chances of pregnancy
are less. If you wish, you can get a serum beta-hCG
measurement. See a specialist for a physical exam and further management. Irregular use of oral contraceptives can lead to irregular cycles and so, follow the dosage pattern rigorously to avoid unnecessary complications. Take care.