It is a normal phenomenon to have an ultrasound with corpus luteum when you are pregnant, indicating that you are still in the early stages of pregnancy. The corpus luteum is formed by the ovary after ovulation and is capable of secreting estrogen and progesterone, which play an important role in maintaining menstruation and pregnancy. The corpus luteum is formed after ovulation and will shrink naturally after menstruation if there is no pregnancy. If pregnancy occurs, the corpus luteum will be transformed into the corpus luteum of pregnancy, which is capable of secreting estrogen and progesterone and plays an important role in maintaining pregnancy. When a woman has an ultrasound in early pregnancy and the corpus luteum is found, this is a normal phenomenon and does not need to be treated. Generally at the end of the third trimester, the placenta forms to secrete steroid hormones to maintain pregnancy, at which time the corpus luteum gestationum will degenerate.