Spotting is a very light form of bleeding that occurs outside ... It may even occur during pregnancy for some women. You may notice spotting by seeing a few drops of red or brown on your underwear ...

about 4% to 7% of women using birth control pills become pregnant each year. While birth control failure can cause this, it is more often due to human error, such as missed doses. Light bleeding ...

When pregnancy does not occur ... PMS symptoms (Pre-menstrual syndrome): Light spotting or cramping a day or two before periods may occur. Some may experience mood swings, headaches or change ...