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Er. University of Michigan Health System. Now, to the rest of you. The accuracy of male gender assignment in this group was 99-100% at all ages, and that of female gender assignment was 91.5% at 12 to 12 + 3 weeks, 99% at 12 + 4 to 12 + 6 weeks and 100% at 13 to 13 + 6 weeks.CONCLUSION:Prenatal gender assignment by ultrasound has a high accuracy rate at 12-14 week Report0 Reply . She said it looked like a "girl" but was not sure cause the cord was in between and might be hiding the boy part. At this stage of development girls have what is called a genital bump that can resemble a penis. posted 02/28/2013 by a BabyCenter Member Report answer Was this answer helpful? Yes No Thank you! 6 out of 9 found this helpful Genital development is not complete until 20 weeks. Fairbanks Clinic, Ob-Gyn Ultrasound at the Fairbanks Clinic, September 2003, March of Dimes, Quick Reference: Amniocentesis, April 2007 March of Dimes, Quick Reference: Chorionic Villus Sampling, April 2007 ACOG News Release: Risk of Miscarriage from Prenatal CVS Test Much Less Than Previously Believed. August 31, 2006.