Previous mama’s, help?

So as I had a miscarriage last time I was pregnant which was only 4 months ago I am wanting to book a 6 week reassurance scan.

I did a clear blue test on Friday that said 2/3 weeks (its now Tuesday)

So I’d say I’m about 2 an half weeks pregnant. But from my last period to my due date I’m 4 an half weeks pregnant.

So can i book my scan for 2 weeks from now? And I should be 6 an half weeks?

Just a bit confused and don’t want to go to my too early yet I really can’t wait An just want to hear a little heartbeat 💗

Thank in advance