Chances of pregnancy?

Ok, here's the story. My girlfriend and I were messing around in the shower for a while. I came, not in her, but maybe 6 inches above her vagina. The area felt like it was covered in sperm. Now, she is on birth control for menstrual problems and has been consistently for 3 months. But, her period is due on Friday and I'm worried that she could be on the 7 day portion of the birth control at this time and her chance of getting pregnant could be significantly higher during this period. There's all the info - what are the chances of her becoming pregnant?