Sex of baby

I had my NT at 12w5d where the tech guessed boy. I had an elective us at 14w1d and the tech said she doesnt see anything that makes her say boy and she wants to send me home telling me its a girl and she seemed pretty confident in this. Now i now its still early and im having another us at 15w1d to verify the sex but idk which to go by? Im not having my hopes up about eother because i know it can go either way but which do you think is more accurate?