"Although vaginal bleeding is a common symptom when a woman has a
miscarriage, many pregnant women have spotting early in their
pregnancy but do not miscarry. But, pregnant women who have symptoms
such as bleeding should contact their health care provider immediately.
Women who miscarry early in their pregnancy usually do not need
any treatment."
"The use of progesterone is controversial. It might relax smooth
muscles, including the muscles of the uterus. However, it also might
increase the risk of an incomplete abortion or an abnormal pregnancy.
Unless there is a luteal phase defect, progesterone should not be
used."
"Many women with threatened miscarriage go on to have a normal
pregnancy."