Second opinion

On the 18th of November I was 7w3d and my OB found the heartbeat, one week later I had spotting and felt very wrong. I decided to go to the ER. My baby measured 8w4d so exactly where it should have but they said they could not find the heartbeat. I’m just confused as to why my baby would measure down to the date but not have a heartbeat.. I am still spotting sometimes more some days, sometimes not at all. I go this upcoming Wednesday for them to do an ultrasound and confirm that I had a MMC. Can someone please give me some words. Good or bad. Do you think it’s possible they’ll find the heartbeat? I am just so devastated.