Does light bleeding in early pregnancy mean I am having a miscarriage?

No. It is very common to have some spotting in early pregnancy because little capillaries on the cervix frequently bust open spontaneously or with intercourse.
No. There are many benign causes for spotting or bleeding early in pregnancy, and 30% of all women with normal pregnancy outcomes will actually have bleeding in the first trimester. Of course it is important to contact your physician if you are having bleeding with your pregnancy, but it does not mean the pregnancy will end in miscarriage.