There is always a possibly to fall pregnant if you are having unprotected sex. As many precautions we take sometimes it just happens. . .

The only way to tell for certainty would be to get a blood test done by your doctor. (ifyou suspect pregnancy this should be done before continueing with Birth control - just make sure you use other protection in the mean time)

But in my experiance I would assume that your period is just a little wacko from missing the suger pills.. Continue to take the pills as normal and it should return to normal. . .

HTH