Your bleeding is perhaps because of the hormonal
imbalance created by the pill. Also, the pill is more effective when used with a followup dose. The chance of your pregnancy
depends upon the time of intercourse with respect to your cycle and the efficacy of the contraception
followed. You may get a disturbed cycle this time. You can wait for your period as per schedule and if it does not appear, go for investigations and see your doctor for further advice. Take care.