7 weeks 1 day and measuring 5 weeks

daisy

Last week I had a scan and saw only a sac and she predicted 4 weeks. 5 days later there’s a yolk sac and feral pole but no heartbeat yet, she said it’s measuring about 5/ 5.5 weeks (2mm). Has anyone else not seen a heartbeat at this point and it turn out okay? Also, to be measuring about 2 weeks behind.