6w4d abdominal ultrasound - sac but no embryo

Abby

Went in for an early abdominal ultrasound for a peace of mind (kind of regret it now) as my first ob visit isn’t until July 2. Based on my LMP, I should be 6w4d today but the ultrasound technician informed me my gestational sac measures 7w2d. I’m confused! No embryo in sight and I’m really sad 😔 Is it too early to see anything via abdominal US? Anyone with a similar experience?