Plan B during ovulation

Patient: Dear Doctor,I had protected sex with my boyfriend on January 14, but the condom broke and he ejaculated inside of me without realizing that it broke. I immediately took the Plan B pill an hour afterwards.My problem is that my last period started January 1st, and I do have a regular cycle. I fear that the day that we had sex was around the time I would have started ovulating.What is the likelihood of Plan B failing due to it being around the time in which I am probably ovulating?