My son they picked up a H/B at a day or so before 6 weeks on a transvaginal U/S, but that was VERY early. There should be a detectable H/B by 10 weeks, many hear it around 8-9! Good luck!
Some people don't even detect anything at 6 weeks though due to conception dates not being completely accurate a person could actually be off by a few wks.
Normally around 6 wks..some can detect it a little sooner, but not always hun....so sorry for your loss...best wishes.
I believe 7 weeks through doppler. At 6wk 3 days I saw and heard heartbeat on ultrasound but the doc even said they don't usually hear it that early. But home Doppler can detect heartbeat as early as 7wks. Of course it's not 100% detectable then but it does happen. Buy a fetal Doppler of you think it would reassure you. I did after I last miscarried and I got it at 9wks and heard the heartbeat then and there.