welcome to HCM
read your prob, if dead fetus present in uterus
more then 4 wk then 4wk then collepsed gastationl sac seen in sonography
.it is may be due to dead fetous or due to mole.
so you have to rule out the cause of it .first u have to expell it out by your doc.
Dr aseem saraswat 9982583020