Private gender scan opinions

I have booked a private gender scan for Wednesday 28/05 and my gender reveal is for the same day (2 hours later) so I have time to pick up my partners family so they can attend. We are very excited to find out what we are having so that we can start buying more in colour rather than white. My question is has anyone been and not been able to find out the gender as we didn’t consider this until now (our first baby after nearly 5 years or trying) due to our excitement. Someone said what if we can’t find out then what and now I’m spiralling, this is the only day we can have both family’s present for weeks. Would love to hear your stories of private gender scan.