First doctor app too soon?

Corina
So according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">Nurture</a> app I am almost 5 weeks pregnant took 5 home pregnancy tests and all came positive. Went to the doctor today and just had my annual check up and he said I will have to be patient and wait another 3 weeks to actually confirmed pregnancy which is do my first ultrasound and order blood work! 
He said due to my history (myomectomy and one miscarriage) I will have to be patient and wait until then 
Is that normal?