Hcg Levels

Aum

I found out I was pregnant June 16th my HCG levels were 5949 the Emergency doctor said I was about 5w2d but my ultrasound said I was 4w2d. I went back 5 days later and My hcg levels were 17,356 and doctor said I was 6w1d but ultrasound said I was exactly 5w0d im sooo confused 😩