How far am I?

Nour
Okay guys I need help here please! So my last period was on April 20 it lasted till the 27th we have unprotected sex on May 8th,14th and the 22nd soo did a pregnancy test on the 24 got a bfp went to the doc did blood work and said I was only 1-1/2 to 2 weeks preggo so how far exactly am I and when did I conceive??