2nd ultrasound- 7wks

Ana

I’ve been at my 2nd ultrasound just now and according to my last period I should be 7 weeks, the ultrasound measured a CRL of 6.7mm and GS of 29 mm and there was no heartbeat. She asked me to come back on Monday and check again. I’m really nervous now, it’s my first pregnancy and I don’t know how I’d react if there was no heartbeat on monday. Did anyone else go through this? I feel like the gestational sac is too large compared to the embrio CRL.