Hello doctor, how many weeks old is a fetus when there is a heartbeat? My wife had an ultrasound and the doctor said the fetus is 8 weeks old but there is no heartbeat and said the fetus is stillborn. What does this mean?

Hello doctor! I am 6 weeks pregnant, I went to the doctor and was diagnosed with a fetal growth arrest because there was no fetal heartbeat, then I waited for a week and had abdominal pain and bleeding. I went to the hospital and the placenta had come out, the ultrasound doctor said there was nothing left but fluid and blood. That means I had a miscarriage, but 2 days later I had severe abdominal pain and the fetus was gone, the fetus was as small as a baby's little finger. So I would like to ask the doctor: "Why does a 6-week-old fetus stop developing and have vaginal bleeding but still have the shape of a fetus?" If I was still pregnant when the placenta came out, would the fetus still be alive? Thank you doctor for your advice!

am 5.6 weeks pregnant. However, I had brown bleeding, the next morning red bleeding, no abdominal pain. I had a transvaginal ultrasound and was diagnosed with a deformed, uneven gestational sac, no fetal heartbeat. Therefore, the doctor concluded that the fetus had stopped developing and prescribed me to take abortion pills tomorrow. Doctor, can you tell me, is it dangerous for a 6-week-old fetus to have no heartbeat and a deformed gestational sac?

My period is 8 days late, the test shows 2 lines, I had an ultrasound and the pregnancy was 5 weeks, the doctor scheduled another check-up in 2 weeks. After 2 weeks, I went back to the doctor and he concluded that there was no fetal heartbeat and the fetus had stopped developing through ultrasound alone, but I still had normal morning sickness, no abdominal pain, and no bleeding. So, doctor, can you tell me if the fetus has stopped developing but there is no bleeding, is it dangerous? Thank you, doctor.