Help! How far along am I? Confused.

Nicole
My last cycle began in June 29th and I tested when I was 6 days late last Thursday and it was positive. I thought that made me 6 weeks 2 days pregnant. But this app is saying 5 weeks 2 days. Sooooo. I have no idea. I'm going to have hcg blood draw tomorrow but won't get those results until Mon or Tues probably.