Confirmation ultrasound, embryo no Heart beat

Rain

Went for the ultrasound today, we were able to see the embryo measuring 5w6d and not 6w1d based on FET transfer date. Dr. Told me it might be a bit too early to see the heart beat flicker and schedule another ultrasound in a week. Any of you had a similar experience ??? I guess I’m want to know if someone had a happy second ultrasound ....