Can Clear Blue digital date results wrong?

Georgia • 21 years old. Alison 17/01/16💖 Diesel🐶💙 16/06/17👼🏻💜 26/10/17👼🏻💜 30/01/18👼🏻💜 Henry 16/11/18💙 15/11/20 👼🏻👼🏻💜
The doctors think i am about 6 weeks due to the dates of my last period. I got really uneasy last night and had concerns as when I took my pregnancy tests (i did 5) they all came back very faint (they were the two line ones.) so last night i went and got another one and the test said "pregnant 2-3 weeks" can the results be wrong or am I not as far along as I thought?