I also had a vanishing twin. I experienced brown spotting and mild cramping for a couple of weeks. It looks like my body as fully absorbed whatever was left as it no longer shows up on ultrasounds. Good luck.
It depends. You may bleed, it could stay in until delivery of the other baby you would have to ask your ob what will happen. I'm so sorry for your loss
your body should pass it on naturally - other wise there is a way for it to be reabsorbed by your body.
What advice did your doc give you regarding this?