Serious birth control question? Help!?

my girlfriend recently just purchased a birth control that was sunday start. we didn't know we had to weight 7 days for it to full and had the next day anyways. We had unprotected , but I always put a condom on to finish inside of her so I did not *** inside her. If she takes the pill perfectly for the rest of the month, what are the chances that she is pregnant. Does taking the pill deter her chances of being pregnant? thanks