Needing some guidance....

I had my transfer on the 30th of August.
I got a BFP on the 4th of September at 10DPO, 5DP5DT.
I have POASed on a million pregnancy tests- all positive- lines seem to be getting darker.
I'm so scared- I had a chemical pregnancy last month, and I'm worried that might happen again
I'm feeling nauseous when I'm not eating- tender boobies--- but I'm on progesterone pessaries- could that be causing the pregnancy symptoms?

My BT is Monday- I want to have it tomorrow instead- ill be 13DPO, 8DPT.
Will I get a good enough result? Or will I worry more because it's early, so could be low reading?

GAH- you deserve a medal if you got through this.
I am scared ****LESS!