I Have Been Taking Microgynon 30 Since January Now. I

I have been taking Microgynon 30 since January now. I started my period break last Monday and I am taking my next pill tomorrow but my period hasn't come. I had unprotected sex whilst I had 3 pills left in my pack. I did my research on the nhs website and it says its highly unlikely im pregnant as I have taken my pills correctly. What do you think? Could I be pregnant?