Follow up from last u/s

Hi ladies, so I went for my one week check up yesterday & the doctor told me she now sees another sac connected to my sac meaning I have 2 gestational sacs...meaning multiple babies, one is just taking longer to grow cuz i conceived later...or bc it's not a viable pregnancy :( ...the baby has grown at where it needs to be (7weeks) but that she could not detect a heartbeat. I think it was just an hard u/s and the baby wasn't positioned right. I'm going for another u/s this morning cuz I'm going crazy. I have another u/s with a specialist next week. Wosh me luck :(