No heartbeat at 6 weeks 4 days

C

So my dr called me and said they didn’t detect a heartbeat and wants me to come back on Monday for another ultra sound and to do blood work to check my levels so by that time I will be about 7 weeks.

Can anyone tell me when their baby’s heartbeat was detected... if it was at 7 weeks or later?

Looking to ease my mind a bit till Monday :(