I've Just Finished By Package Of The No-name Brand Of

I've just finished by package of the no-name brand of YAZ birth control. I started the package late and then had spontaneous unprotected sex while on the 3-4 pink pill in the package. I took the Plan B pill, 2 pink pills from the YAZ package, and another Plan B pill that is more effective for women over 176 pounds within 3 days of that unprotected sex. Today is the 4th sugar pill day in my package and I still haven't gotten my period. Should I be worried that I'm pregnant?