I recently went for my first scan this pregnancy when, by my records, I was 6w4d. However on doing the scan, the doctor informed me that the baby only measured 3.8mm and so I was only 5w4d.
However I have been doing some research, and everything I am reading says that,
"5 ½ to 6 ½ weeks is usually a very good time to detect either a fetal pole or even a fetal heart beat by vaginal ultrasound. Here, the fetal pole may be seen at a crown-rump length (CRL) of 2-4mm, and the heartbeat may be seen as a regular flutter when the CRL has reached 5mm."
Am I worrying about nothing? I have had three miscarriages in the past so the doctor is being overly cautious, but I do not want to stress out needlessly.
Also, should I base my date on my LMP or the scan? We have been trying for 6 months so we are sure of the dates...
Any advice would be greatly appreciated.