To answer the question on why I had a scan at 16 weeks instead of waiting for the 20 week one - there are a few reasons, that added all together made it worthwhile for us...
Firstly, I've got 2 older DCs who are old enough to be interested in the new baby and want to be involved in whats happening, but who are at school for the usual NHS scans. I thought it would be lovely for them to see their baby brother/sister themselves on the screen and they seemed very interested in doing so.
I didnt particularly want to take them to the NHS scans (even if they hadnt of been at school) as the main purpose of those is medical to check all ok with the baby and I didnt think it appropriate for children to be there. With a private 'for fun' scan after the NHS 12 week one, so knowing all was ok with baby so far, and that could be booked for a Saturday, it would be the ideal chance for the DCs to be part of it.
Another reason is that my eldest DC has autism. He finds it harder to understand about the baby in my tummy and wants to know exactly 'which baby is it?'. We felt knowing the sex of the baby and deciding on a name so we could give him more details on 'who the baby is' would help him understand it all better.
With the gender scan at babybond, you get a selected number of views during the scan in 4D. This being my last baby and added to the the above reasons, I thought why not hve the opportunityy to experience this myself? I'll never get the chance again!
Also, a lesser reason but one that influenced me a little bit when deciding to book the scan - is that my DH was very keen on having a DD ( I think one reason being that we are nervous of having another DC with ASD and I think that is much more likely with a boy). I know that if it was a boy he would come round to the idea, but I wanted to find out as soon as possible to start that process and so I could stop worrying about how he would react and so that he could get used to the idea well before the baby is here!
It says on the babybond website that the accuracy rate of gender scans after 16 weeks is >99%
So I am hoping that they are right this time too!!!
I like to be sure about things so I am glad to have had this scan already so when they tell me at me 20 week scan it will be an extra confirmation so I can be extra sure!!
Hope that answers your curiosity a little! 