is not a contraceptive; it is a hormone. If you happen to have ovulated during this course, there is a chance that you may fall pregnant, but given that you had cycle disturbance prior to this, it is more likely that you went in for a hormonal
imbalance and could not have ovulated in such a situation. Since you are back on your pills you need not worry, just monitor your cycles and go for a test if you miss a period at the earliest. Take care.