Question on Birth control

I missed a day of my birth control pill and by the time I remembered it was the next day around the time I normally take my pill. I took two pills then and the next day after that had sex. I'm wondering if I should use plan B to prevent pregnancy or if I was protected with the pill (obviously I know the pill even when taken religiously is not 100% effective) I just want to know if I should use plan b. We didn't use a condom 

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