hi, the usual causes of bleeding in early pregnancy are, - gestational sac while getting embedded in uterus wall can damage some blood vessels leading to spotting, some women may have bleeding on expected day of periods even in pregnancy, increased blood supply to local organs can cause spotting even on mild friction. so if she is not having associated symptoms like pain abdomen and if the baby is healthy then the chances of miscarriage are less, she can once get examined locally to rule out local causes and can take progesterone tablets with your doctor s advice as precautionary measure. take care.