I went down the 2-WW Rapid Access pathway with the breast cancer scare. The Oncologist I worked for at the time who was a Lung and Upper GI Specialist told me that only one in 100 is malignant.
Only one in 100 pregnancies are ectopic but I had to be that one in 100 !
I remember when I got the all-clear - I couldn't take it in. I had convinced myself resolutely that I was going to be told the worst.
You are a never-smoker, so you at least have that in your favour. I understand there are other risk factors, but the chances are slim.