Does I-pill Cause Vaginal Bleeding?

Hi, I took an i-pill after a few days of my having my periods as the protection had failed. Now it must have been more than 5-6 days of me having taken the i-pill. And suddenly I am having vaginal bleeding. This does not seem like a normal period. Is it the side -effect of the i-pill? This was the second time I had to take it because of the protection failure .