I went to my sister’s ultrasound when she was 10 weeks pregnant. I could hear the heartbeat well. Usually you can start hearing a heartbeat at 6-8 weeks. It’s barely detectable at 6 weeks, but you’re more likely to hear it by 8 weeks. My sister was even able to record the heartbeat and send to the father. They had the sonogram on a tv with speakers since this wasn’t at a usual clinic or hospital but a pregnancy care center. That may be why it varies for others. :)
Well, my son is 12years old now, so i guess alot changed and improved since my pregnancy. At my times, we just were able to see the heartbeat in the first weeks, while the computer recorded it. I bet there are ways to bring the recorded video into a sound nowadays. =)
...but some things aren't well looked up or the translation isn't good enought (i still appreciate it. Thank you to the uploader. ♡). A 8weeks old baby isn't as big as a fist, it's like the size of bean. Also, even if you can see the heartbeat with 8/9weeks, it's almost impossible to hear it. I was happy enought to hear it with 19weeks. Usually (if it goes after my hospital and my doctor) you can hear it from 22+weeks, if you're lucky a bit earlier like me with 19weeks. Still, i like the story. I hope he will have a safe labor and they can life happy together with their baby. ♡