Pregnancy During Novelon tablet consumption

Patient: Hi Doctor, I am taking Novelon tablets (21 tabs strip) first time as prescribed by my gyne to maintain hormonal imbalance (to make me perfectly harmonically balanced before getting pregnant), starting from 5th day. and already perfectly completed course of 21 tabs, for last month. Now in this month, Like periods start date is 7th and then started taking Novelon from 11th. Yesterday, I found that I missed to take tablet for any day and also I did unprotected intercourse single time with my husband on 19th (not sure that if I missed tablet on 19th). so please tell me is there chances of getting pregnant or if yes then as am still taking Novelon tabs so should I stop taking because these tabs could have negative impact on expected child. Please reply, prompt reply is highly appreciated.Thanks.

Symptoms: No