Hello, I would be happy to help you with your question.
It is always possible that you are further along than you think you are! Sometimes there is bleeding in early pregnancy
that can be confused with a normal cycle, and give a patient a false sense that they are NOT pregnant when they really are. You need an ultrasound
to assess exactly how far along you are. If your doctor is right, you are 6 weeks and 2 days along, and you SHOULD be able to see a pregnancy at this point.
I hope that this helps and good luck!