I’m just need to know what to expect. Last week I went for an early scan to check viability. Measured 5w6d (according to BBT O date I should have been 6w4d) and HR was 100. Today, six days later baby measured 6w3day and HR was 99. The tech said nothing. No follow up scan. Just said a doctor would read the scans and be in touch. I had a missed miscarriage three years ago but that pregnancy didn’t have a heartbeat. Is this an impending miscarriage? Any hope that baby can catch up?