My girlfriend last period started on the 31st of May. On the 14th of June, we had sex, and the condom broke, but I didn't come. I changed the condom and this time I pulled out and come on the condom. After an hour, i bought Plan b and gave it to her. She felt dizzy after 3 hours of taking it and the next day too, but now she is okay. What are the chances of getting pregnant?