Why does 6 weeks of pregnancy stop developing, vaginal bleeding has the shape of a fetus?

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Hello doctor! I'm 6 weeks pregnant, I went to the doctor and was diagnosed with fetal growth restriction because there was no fetal heart, then I waited 1 week and then I had abdominal pain and bleeding. When I went to the hospital, I had a placenta, the ultrasound doctor said there was nothing left, only fluid and blood remained. That is, I had a miscarriage, but 2 days later, I had severe abdominal pain and was pregnant, the shape of the baby was as small as the baby's little finger.
So the doctor asked me: "Why does 6 weeks of pregnancy stop developing, vaginal bleeding has the shape of a fetus?" If I am still pregnant in my belly when I have a placenta, is the fetus still alive? Thanks for the advice doctor!
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Hello! With the question: "Why does 6 weeks of pregnancy stop developing, vaginal bleeding has the shape of a fetus?" Then the doctor would like to answer as follows:
Your case at first 6 weeks antenatal check-up stopped growth because some indicators of fetal development were absent, such as no fetal heart activity. However, in addition to that sign, there will be other signs for the doctor to conclude that your pregnancy has stopped developing such as the edge of the amniotic sac, amniotic fluid, yolk sac,... Then, 1 week later, you see bleeding and pain That's when your pregnancy has already miscarried, so the ultrasound only shows blood and fluid. The same happens when the fetus stops growing. 02 days later you have abdominal pain and the image you see at that time is not the pregnancy and the placenta, but the blood in the chamber. Because of such a small gestational age when having a miscarriage, you still cannot see the placenta and the fetus with the naked eye. Even doctors have to filter it and put it on a microscope to see it.
To learn more and get thorough advice on fertility planning, you can go to the hospital of Vinmec Health System. Here, there is a team of qualified and experienced doctors who will give you the best advice. Thank you for trusting and sending questions to Vinmec. Wishing you lots of health. Best regards!

Answered by Master, Doctor Trinh Thi Thanh Huyen - Obstetrician and Gynecologist - Department of Obstetrics and Gynecology - Vinmec Hai Phong International General Hospital