pregnancy not showing on scan?

Rebecca • Beautiful baby girl born 12th September 2018 - love my little family 👨‍👩‍👧🐶

if anyone can share their experience.. these are my HPTs on 24th, 25th, 27th, 28th and 30th December, darkest being most recent so I know it's not a miscarriage! Also mentioning that today's was done at about 2pm, the rest have all been FMU! Do these look like fairly normal progressions or do they look too slow? I believe I'm only 5 weeks so could it be too early to see on an internal scan? a few places on the internet say it's too early. but at my appointment today they mentioned POTENTIALLY an ectopic pregnancy. I didn't take my tests with me as the scan was meant for something else, but since it's been booked I have then found out I'm pregnant! please input!