Period one week after taking just two birth control pills?

Hi, my wife decided to go off the birth control pill (Yasmin after taking the the first two pills of her new month. We had once the day right after and i was wearing a condom, but now, five days later she is having a very light period more than just spotting, but with extremely light cramps. We're pretty certain there's no way she could be pregnant because it was her safe week, she had the pill in her system and I was wearing a condom, but we're just not sure. Is it possible she is having a withdrawal period from just two pills?