Early pregancy - first ultrasound help

I got my positive test on 28th April with a clear blue digital with the weeks indicator. It was 1-2 weeks pregnant. The first day of my last period was 22nd March but my cycles are irregular.

I went for a private ultrasound which was abdominal as I believed I was 7 weeks and 2 days but he couldn’t see anything not even a sack.

Has anyone else had this? I have had several positive tests so could it be possible the dates are wrong and it would be too small to see with an abdominal ultrasound. Maybe I’m around 5-6 weeks?

The GP doesn’t seem concerned but waiting until 12 weeks to see if it’s a successful pregnancy is a killer

Your hep is appreciated ladies