Coming off the pill


I recently came off the pill Rigevidon and I wondered if anyone had irregular periods after doing this? Mine is a week later so I'm beginning to panic about being pregnant after a little accident in the bedroom. Didn't get the morning after pill as it was after my ovulation according to this app but that could also be off after coming off the pill? I've never been irregular before but can't do a test yet as it's not been 3 weeks.