The only way to know is to have a fetal heart rate taken. If you are far along enough that you were previously feeling strong movements, and now you aren't, that is a good indicator. If you have concerns, go to a doctor ASAP as this is a medical emergency.
The dead fetus will start to decompose like everything else that is dead and if not removed you will get a serious infection, blood poisoning and become sterile and can even die.
No, a sac grows to accommodate the fetus and if the fetus us dead it does not grow anymore.
Pregnancy
Fever, pain, unpleasant odor, changes in discharge - any or all of these symptoms are signs of infection and need a call to the doctor.
The fetus is generally already dead when the miscarriage occurs.
Eventually she will get serious infections since the fetus will decompose inside of her. That will spread and get into her bloodstream and finally kill her unless she gets treatment and the fetus removed. It would be very painful. If you suspect you are having a miscarriage you have to see a doctor and also if you don't suspect it you have to go to regular checkups to make sure everything is normal.
Delicious ;)
Wouldn't know unless there was more detail. There are many circumstances that can cause a miscarriage or a birth ending in stillbirth prematurely.
Usually not. A fibroid should be a round mass in the wall of the uterus. A dead fetus would not be round and would be in the uterine cavity.
There is a very high risk that the dead fetal tissue will become infected.
if you get an infection and it's not treated, yes!
If you die when you are pregnant, an attempt will be made to save the live of the fetus, but, most of the time when the mother carrying the fetus dies, the baby inside of her dies as well.