confused 😶

I'm confused ladies 😶 
I don't know if I'm actually 6 weeks and 4 days preganet ..? Okay my last period was January 19 then we didn't see no baby at all no gen sac nothing feb 28 I went back and I seen a gen sac the doctor said I was 5 weeks and 1 day pregnant from that acceleration I been I calculating the weeks I'm supposed to be. but to me my caculation seem to be wrong ..?