Home » Calculators » Ultrasound gestation periodUltrasound gestation period Embryo length, mm Please, Enter all values correctly.Pregnancy term weeks days PrevPreviousCrown rump length NextChild gender by updating the bloodNext How useful was this post? Click on a star to rate it! Submit Rating Average rating 0 / 5. Vote count: 0 No votes so far! Be the first to rate this post.