12w+4d pictures and 19w+2d pictures. Still confused, and I nedd your guesses

Depending on the 12 w +4d pictures, some say boy. And days ago I had an appointment for 19w+2d ultrasound, which says girl. But some of my friends still say it is not clear and do it again later.
I'm not sure if I should do it again to confirm the sex before I start buy clothes. I need your guesses and help here. I may schedule an appointment for 24 w scan. I Don't know if there is a nub in a 19 w picture or not.

Here are the 12w+4d picture,
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And here are the 19w+2d pictures

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Was your ultrasound tech confidant that it's a girl? Sometimes the pictures don't always show the real picture as clearly as what the tech saw while scanning.

Thank you nicoler for your respons, and I'm sorry for my late response I had busy weeks. Regarding to your question, I'm not sure if she was confident or not. We have another ultrasound in approximately two weeks. It will be the 8th month ultrasound. I'm still curious!!