Help

I was with my gf and the condom broke which stressed us out big time. I got a plan b and she took it about 4 or so hours after sex and felt fine until about 3 hours after taking the pill where she described feeling violently ill. It’s day 9 of her cycle and they typically last 31 days and are sometimes irregular and longer than that. Rarely ever shorter than 30 days. Is this a high risk scenario for pregnancy? What to expect?