u/Historical-Muscle507

Please I need some advice. The first day of my LMP was March 5 and on April 16 at 6:20pm (6weeks) I went to have a private ultrasound scan and they could see sac, yolk and flickering heartbeat measuring 3.3mm and the following day April 17 was my NHS scan 9:20am I went in with my husband with so much confidence but they could only see Sac and yolk, no fetal pole or flickering heartbeat.

I went to another scan place and all they could see is Sac and yolk. I am so confused and wondering how the embryo could vanish in 15 hours? Has anyone had anything similar? I am not cramping or spotting.