Period conflict?

Okay so according to this app it says my period was expected on the 2nd of this month, but I'm on birth control so I couldn't get a period on the 2nd cause that was the end of week 3 of this months pack, so am I still considered late even though I was still taking active pills for that week? Should I be worried it didn't come on the 3rd since it couldn't be here on the 2nd? This week is my sugar pill week.