Last time ultrasound question pleeeaase answer

OOOkkk so i posted last night and a few days ago and havent gotten too many answers so bear w/ me people =) haha so we went for our 20 wk u/s and the cord was between the legs so we couldnt tell the gender =( The tech said she didnt see any boy parts at all, but she seen 2 white lines then the cord... so she said if she had to guess she thought it was a girl, but only gave us like a 60 percent chance! I seen my doc for a follow up and told her what the tech said and she told me that if there were 2 lines, it would most liekly be a girl since little boys wouldnt have lines like that. Is that true? What are your opinions and experiences??? Im going insane since I wont get another u/s till the end of my pregnancy and curiousity is killiing me!!! Thanks in advance