had an ultrasound at 7 weeks, the gestational sac is 16mm, the crown-rump length is 10mm, the fetal heart rate is 146, I have a miscarriage. The doctor said that the gestational sac does not correspond to the embryo, if the gestational sac does not develop, the pregnancy will stop. So doctor, can you tell me how to improve a 7-week-old fetus with a gestational sac length that does not correspond to the embryo? Thank you.