My Baby is measuring 6 days behind on every scan. I'm 11 weeks but have has 3 scans to check heart rate due to some extra risks (1 private, 2 NHS) at 8, 9 and 11 weeks. Heart rate is fine, thank God! Though in every one the baby is 6 days behind where it should be. I ovulated CD16, which would explain 2 of the days, but then I tested positive 11DPO. So I couldn't have implanted very late. None of the medical staff are very concerned, but I feel like that's because they can't really tell at this stage, but it could be a problem? Other posts seem to have one scan behind then they catch up by next scan. But 3 in a row?