Boy or girl?

3 weeks ago we had our 20 week scan. During this scan we were told baby was a boy but since have been warned multiple times they could have gotten it wrong and that the ultrasound photo doesn't look like a boy. We didn't get a full photo of baby and she kept saying baby was in the wrong position but then without baby moving said baby's gender was a boy so it was all quite confusing.

We are now worried to buy any boy things in case the gender is wrong.

Last night my step mum had a look and she said the ultrasound looks like her daughter's one when she was told her daughter was a boy and not a girl so now we are worried the gender is wrong.

I know it's not a big deal and we shouldn't stress over it but we just can't help it. I've been told to keep all proof of purchase for any gendered products. We are happy with either gender anyways (well I definitely am, hubby always wanted a boy first and all his family had as well so they may be a little disappointed if the gender was wrong but they'd still love baby either way)