I am a distance runner, as well as play many sports. Since I am so physically active, I rarely ever get my period. I am afraid that if I have sex, and say, the condom breaks, I would be paranoid if I was pregnant or not because I would have no true real way of knowing, since I am irregular to begin with... without a pregnancy test. Any suggestions?

If you've got irregular periods you've got plenty of company. You're right that athletes and other women with very low body fat can be very irregular. So can young women who are just beginning to have periods, same with older women as they approach menopause, and Googling around turned up dozens of other possible reasons.

Whatever the reason if you've got irregular periods and a condom breaks then you want to use emergency contraception within five days.