Is bleeding during early pregnancy common?

Common but... While common to have some spotting, it could signal a more serious issue. Be sure to schedule prenatal care right away.
Yes. Bleeding from implantation, sensitive cervix, and from beneath the placenta are common causes. Of course, some bleeding is a sign of more ominous things like miscarriage or ectopic pregnancy, so a thorough evaluation is indicated, especially for persistent and/or measurable bleeding.