What Does Delayed Periods After Stopping Femodette Pills Indicate?

Hi, I bled a few days ago. I finished my Femodette pills a few days before I had a random bleed. After my pills for the month ended, I bled and then a few days later me an my boyfriend had sex using a durex contraception condom. I havent come on my period yet? Now 3 days or more late, should I be worried?