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The normal uterine lumen is usually not distinguishable.
Features include the forehead at 10 o'clock, the left ear toward the center at 7 o'clock and the right hand covering the eyes at .
I had an ultrasound on 4/26 that dated me 11wks, 2d CRL 45mm with EDD 11/12.
Ultrasound has intrinsic error of upto maximum 5 - 7 days, so the probable dates of sex would have been a week before or after the 19th of February, but in NO WAY as early as January 18th.
Canine gestation length is fairly consistent (65 ± 1 days) when counting after the LH surge.