What Are The Chances Of Getting Pregnant After Taking Novelon?

i started taking novelon for the first time on the 7th day of the period, n after one course i got my period on the 7th day. we had intercourse on 28th day after i started taking tablet. again i started taking the second course from the 8th day and my period lasted only for two days, with less bleeding. is there any chance of me getting pregnant?????????????