how long does a truly empty sac stay around if the baby is not longer in there??

Question

theres a possibility that one of my babies may have vanished. the sac can still be seen though. if the baby did vanish, how long before it goes away? does my body just absorb it or pass it? thanks!

Answer 1

Your body should reabsorb it. Read this.
http://multiples.about.com/cs/medicalissues/a/vanishingtwin_2.htm

Answer 2

If the baby isn't there then your body will see it as a foreign body and attack it sort of like an infection, break it apart and it will come out with your regular vaginal discharge.