Implantation bleeding is usually very light; in fact, this type of vaginal bleeding is often so light that you may not even notice it when it happens. If you do notice when implantation bleeding occurs, you may experience light spotting, or only a single a spot of blood as small as a pinhead on your underwear. Implantation bleeding is not continuous bleeding; the small spot of blood, or light spotting, that you may experience is all that occurs. Sometimes, women mistake the spotting that occurs during implantation for a light period which causes some to think that they had periods during pregnancy. More commonly, women who mistake implantation bleeding for their period don't know they're pregnant!
