Hello, I Just Started Oralcon Contraceptives About 5 Days Ago.

Hello, I just started Oralcon Contraceptives about 5 days ago. I used to be on Nordette, but I took the first Oralcon pill a day earlier than I was supposed to in terms of my pill cycle (I took it on the day I was supposed to take my last Nordette red pill). Will this have any effect in terms of the contraceptives? Is there a possibility I can fall pregnant if I had unprotected sex the day before I started Oralcon?