what do u think ultrasound tech seemed unsure.I'm 18 weeks 3 days She guessed boy then said girl…

what do u think ultrasound tech seemed unsure.I'm 18 weeks 3 days She guessed boy then said girl after I told her I went at 16 weeks and they told me i was having a girl she was very young and was new. I don't see any boy parts ? so I'm confused. I think she said she may had mistaken the cord for boy parts but even I when I was looking I saw girl parts. so now I dont know even tho she changed it to girl. so confusing