Help with weeks?

Whit

Hello,

I’m pregnant with my first baby, so apologies - trying to get my head around it all!

I’m super excited, but want to understand more around how the weeks are calculated.

Took a test yesterday, which came back positive 2-3 weeks.

Took a test this morning which came back 1-2 weeks.

How do I calculate how many weeks I am?

My last period was on the 24th July.

Waiting to have an appointment with the midwife!