Ultrasound is not generally considered a 'prediction', (either they see 3 distinct lines that is the labia of a girl or the penis of a boy or they are not sure)and 18 weeks is a pretty standard time to do one for the sake or determining the baby's sex. Doctors and ultrasound techs know what they are doing and what they are looking at even if you don't. It is greater than 95% accurate, but only the person who did your scan knows how good they saw the baby's genitalia. I would not count on it being wrong.
I had my first ultrasound at 16 weeks and the dr told me i was definitely having a little boy but then when i went back at 28 weeks they said no no it's definitely a little girl. I said no you all showed me before its a boy she disagreed and showed me her proof of it being a girl so i said ok and went on to have a pink baby shower. I ended up taking a pink outfit and a blue outfit to the hospital just in case and guess what... we left wearing BLUE yes i had a handsome little boy and a whole lot of returning to do. I'm just glad we choose a gender neutral theme to decorate the nursery in.
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