Large gestational sac without fetal bud and fetal heart

At 40-50 days of pregnancy, through B ultrasound can see the pregnancy sac tissue, at this time there is no obvious fetal bud or fetal heart is relatively normal. If there is no fetal bud, fetal heart, and irregular pregnancy sac at 80-90 days, it should be fetal arrest, you can take drugs to promote uterine contractions, speed up embryo discharge.