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Dating ultrasound too early
Conception would have surrounded this date within 1-3 days. I assume that the small subchorionic bleed you mention was seen at 6 wks?
Throw in the margin of error of an early ultrasound & you can possibly expand conception range by a few more days. Given your age and history, your pregnancy would certainly be considered high risk.
When having a transabdominal ultrasound, however, a full bladder is necessary in order to “lift” the uterus up and out of the pelvis so the embryo can be seen more clearly.
Later on as the pregnancy progresses, a full bladder is not necessary as the enlarging uterus is no longer contained in the pelvic rim.
Other reasons to have a 7 week ultrasound are to: The embryo will be measured from the top of its head, the “crown” to its bottom or “rump”.
This is because it is the longest portion of the embryo’s body and provides an ideal measurement baseline of growth and development.
This is the period of time which provides the most accurate assessment.
Generally, ultrasounds which are performed in the first trimester are within 3-5 days of being accurate in terms of assessing gestational age.
The limbs and the yolk sac, though obviously important, are not the primary means of measuring growth.
An average length of the embryo at 7 weeks is anywhere between 5mm-12mm. Obviously, every pregnancy is unique and individual factors influence the size of the embryo at this early stage, and the embryo shows development week by week.
As such, you should be closely followed by an obstetrician with frequent sonos to assess fetal well being with consideration for induction or c-section if appropriate. Read more 14 week ultrasound is on the cusp between first and 2nd trimester. Read more Based on your dating ultrasound, your estimated date of conception would have been 2/26. Month=9&day=6&year=2013 which is a conception calculator your estimated conception date was 14 december 2012 (between 12 to 17 december 2012).
First trimester ultrasound usually accurate to 3-5 days. So at 14 weeks I would doubt the dates would be 2w3d off. This assumes a regular 28 day cycle and ovulation on day 14 of the cycle.