15. Physical exam reveals the uterus to be about 6 wk size. Vaginal bleeding is scanty with no discernible tissue in the cervical os. There are no palpable adnexal masses. The uterus is mildly tender. Ultrasonographic exam does not reveal a gestational sac. Which of the following should be recommended?
a. Dilatation & curettage.
c. Observation followed by serial B-HCG determinations.