Nervous

Sierra
So today I go in for a 3rd opinion on if my baby has a heartbeat and the measurements 
My Ultra sound tech doctor and the Energency Room are measuring two different sizes for baby.  Ultrasound tech said I was suppose to be 10weeks but baby measuring 8 weeks & there's no heartbeat but ER said there's probably no heartbeat because baby is only measuring 7 weeks so now I go to see a different OB and ultrasound tech today also I had my menstral April 3 til April 7th then my last menstral May 24 til May 28 I was thinking that has something to do with it. My cycle is way longer then 28 days wish me luck in so nervous!!