With my second we had 3 ultrasounds baby had legs closed everytime we were finally told it was a girl the day I gave birth surprise it was a boy !
mine did. when i went to my 20w she just kept her legs shut. she moved all over the place.but wouldnt open thoes legs. i had to have another one 2weeks later bc it was medically nessesary and i drank a big glass of oj (worse heartburn ever) but she moved all over and the doc got a great look that time.
My second refused to show himself in his first ultrasound but in his second (medically necessary not just to recheck gender) he spread wide open for the tech lol. Our first pregnancy we chose not to find out the gender and be suprised. We had both a girl and boy name picked. I admit i got a little bored with the gender neutral colors but in the end the sweet surprise was worth all the green yellow and white we had to put up with :-)
With my first, I had three ultrasounds done. I even paid to have one that the insurance didn't pay for. My little one kept her legs closed each time. Don't buy anything Gender specific, and enjoy your surprise. Good luck.