I’ll go to the doc this week but I had a question.

How would someone be able to determine due date/ weeks of pregnancy after having a chemical pregnancy a month a ago and testing a BFP exactly a month later. I read somewhere to go by day you think you conceived by when I did that it showed I’m 2weeks pregnant and to my understanding 2 weeks is too early to show a BFP. (See my image). I’m assuming the doctor will go by the day I started miscarriage bleeding but not sure, any idea?