IVF Case- 8 weeks but scan measures 7 weeks and no heartbeat. Any hope?

We came back to the clinic today for our 2nd ultrasound. Our first one was 2 weeks ago, and scan showed GS and was 6 weeks 2 days by then. Today scan, baby measures only 7 weeks and no heartbeat detected on TVS.💔 We were asked to come back next week for follow up scan. I’m still hoping for the best and trying to be strong. Is there still any chance for our baby to develop and have heartbeat by next week?