Scan lady said shape of bladder indicates sex

[emmalinewre]

Is this true?
Had our 36 week scan today (NHS) but the ultrasound techs couldn't tell the gender due to position/size of baby.
She said though that in these cases she usually goes off the shape of the baby's bladder.
She showed us the baby's bladder on the ultrasound and said that an oval shape means a boy, a more triangle shape means a girl. We could definitely see an oval rather than a triangle.
Any tech's out there willing to confirm this?
What do you think?
Thanks!

Not heard this one but at an earlier scan, I remember the doctor telling me about some way of telling if it's a boy or a girl and she said she'd 'put money on it being a boy'

I'm only 24 weeks but the last 2 (very clear) scans and a NIPT have all said girl