It is common for heartbeats not to be visible on an u/s until after 6 weeks as well. I have been able to see my baby's heartbeats earlier, but all of them have been transvaginal u/s as they can't really see much just from the outside. From what you described it all sounds good and normal

You should definitely be able to see a heartbeat on the u/s around 8 weeks so that is something to look forward to.

Sounds like you are in for another TWW. I hope that it is a quick 2 weeks for you.

Congratulations on your pregnancy!!!