yes
Otherwise it can not grow into a baby. It will get no nutrients from a placenta and will be a miscarriage.
If the placenta don't function the embryo will die.
no
In a miscarriage, the placenta may not always be expelled from the body. Sometimes it can remain inside the uterus, which can lead to complications such as infection or heavy bleeding. If the placenta does not pass naturally, medical intervention may be necessary to remove it. It's important to consult a healthcare provider for appropriate care following a miscarriage.
A fetus can die inside you but not come out so then it is still a miscarriage. You have to see the doctor if you suspect a miscarriage.
Placenta Previa
You need to seek medical attention as soon as possible. Even though you have a miscarriage it doesn't mean your body removed everything from the pregnancy. If you still have part of the placenta or baby inside your uterus it could cause severe infections.
It mean that she has had a miscarriage before the full term.
After a miscarriage at 12 weeks, the placenta typically does not pulsate. Once the pregnancy ends and the fetus is no longer viable, the placental blood flow ceases, and the placenta will gradually begin to separate and be expelled from the body. Any residual pulsation might be due to blood flow in the mother's body, but the placenta itself would not exhibit pulsation similar to that during a viable pregnancy.
It might separate from the wall of the uterus causing a miscarriage.
Not all women have a placenta, as the placenta is a temporary organ that develops during pregnancy to provide nutrients and oxygen to the developing fetus. Women who are not pregnant do not have a placenta. Additionally, in cases of miscarriage or certain medical conditions, a placenta may not form or may be expelled before a pregnancy is carried to term.
probably not, what it means is that your hormone levels are still high enough to register on a home pregnancy test, most like due to how far into your pregnancy you were at miscarriage... however! you really need to see your doctor immediately.. it is also possible that your placenta abrupted & you are still pregnant..