So check up ultrasound showed the embryo only grew 1mm and I went up to 6 weeks 1 day in 3 days so 1 day behind. Also the heart rate is very slow but she said it could ok for the stage. I have a very bad feeling about this. I got another check up on Monday. She said it needs to have a strong heartbeat by week 7. At the moment it’s negative or positive. Anyone has any experience with ultrasound scans at 6 weeks?