Second Baby

Sury
Hi... So based on my app I'm only 4 weeks pregnant.. But I took a clear blue test and it says 2-3 weeks which I know you have to add 2 weeks to it. So I could be either 4 weeks or 5... Confusing. Also, Doctor scheduled me at 7 weeks for first check up but the first pregnancy they scheduled me at 5 weeks and prescribed progesterone.. I'm a bit scared that I may need progesterone again but it'll be too late to prescribe.