Bleeding at 6weeks

I had similar event, start bleeding at 6 weeks 5 days. Did ultrascan on the same day I bleed and I found out two things : 1. The baby heartbeats 2. The yolk sac is a bit smaller for the age of 6 week 5 days (seems like just 4 weeks 5 days). I was given duphaston + folic asic. At 7 weeks 5 days, I had brown bleeding (on and off) for 7 days. And on 7th day I had a heavy brown spotting (whole pregnancy symptom stop especially no more tender breast) I rushed to emergency dept to get 2nd opinion and they did vagina ultrasound and confirm that the yolk sac is smaller. Doctor unable to detect heartbeat and they said is still too early (they said yolk sac is just under 6 weeks). They advise to come back in 2 weeks for ultrasound. The next day...I had brown and fresh bleeding. Within 24 hours, I had miscarriage. The whole yolk sac came off. Did I had pain? Yes. Very similar to menstrual pain only. This was my second pregnancy. My experience with 1st pregnancy were only light fresh blood spotting within 48 hrs just about two weeks after my last 1st day of period. This baby is now 3 years old.