I had Breast surgery while I was unknowingly 9 wks pregnant: Could the anesthesia have caused my miscarriage 2 weeks post op?

I did not know I was pregnant at the time of surgery, however a pregnancy test was taken. I do not know the results but assuming if it read positive I would have been told. I miscarried about 2 1/2 weeks after surgery. Based on my hormone levels I was around 9 weeks pregnant. Is there a relationship between the general anesthesia or the surgery that would have caused this?? I would think the test taken by the office would have shown up positive at this point.