Women who are pregnant should not be alarmed if they are spotting or appearing to menstruate, but they should be aware, especially if this happens after the first trimester.
Spotting is characterized as a few drops of blood in the underwear, or discharge that is light pink in color. Although this spotting may appear to be a light period, it is most likely implantation bleeding, as the egg inserts itself into the uterus.
Spotting or light bleeding usually appears about six days after becoming pregnant and lasts only two or three days.
The amount of bleeding should be lighter than a regular period but may require a sanitary napkin or tampon, which are safe to use during this time. Monitor the bleeding to determine how long it lasts. If bleeding lasts longer than a few days, it could be the sign of a miscarriage.
Besides implantation bleeding or a miscarriage, spotting can be a sign of endoscopic pregnancy, where the fetus grows outside the uterus, or placental abruption, where the placenta becomes detached.
Consult your doctor immediately if any bleeding occurs, especially if you are bleeding after the first trimester. Other causes of vaginal bleeding include placenta previa and the mucus plug dislodging from your cervix.