How quickly can a fetal pole disappear at 6 weeks? I had 2 scans, 2 days apart. In the first scan (private) a fetal pole was found (2.8mm CRL) and in the second scan which was a referral to the NHS because they picked up on a bleed, there was no fetal pole detected. She just said she couldn’t see one, but could see a yolk sac. Could it be that she just couldn’t see it? First scan was trans abdominal, second was trans vaginal. The attached picture is a photo of the fetal pole from the first scan.