Spontaneous abortion shows clean or blood? What's going on?

Women in spontaneous abortion, if the B ultrasound intrauterine pregnancy has been discharged clean, but there are bleeding symptoms in the vagina, this may be because the endometrial thickness caused by symptoms, you can do not worry, in the daily observation can be done. In addition, if it is in abortion a month after this phenomenon, also does not rule out the possibility of menstrual cramps.