According to the American Pregnancy Association, a woman who is pregnant sometimes experiences light or irregular bleeding, but it is not actually her period. This bleeding is not as substantial as the bleeding that occurs during a period.
The American Pregnancy Association states that some pregnant women experience light, irregular bleeding when pregnant and confuse it with their periods because the bleeding does sometimes happen around the expected time. This bleeding is not enough to require the normal type and amount of sanitary products. Women who experience bleeding as substantially as they do during a normal period are unlikely to be pregnant. Some women experience spotting or bleeding after a positive pregnancy test. Most pregnant women who experience such bleeding go on to have healthy pregnancies, but it is wise to seek medical attention to rule out complications.