17 week scans??HELP please

Kay G • I have a 6 year old son and currently pregnant with my 3 technically as lost a baby two years ago. Hoping for a girl!
Just wandering as my guy doesn't agree, I had a scan yesterday at 17 weeks and they said boy ok that's fine but I don't see it really it looks more like a bobble then a Winkie? Has anyone had a 17 scan with maybe boy bits then turned out to be a girl??