Post Tubal

A little over a year post tubal ligation.

Took a test in December with a very faint line. Called my doctor and she ordered blood work. I did the blood work and it came back negative so she did not seem concerned. I did start my period a few days later, but it only lasted 3 days and was fairly light.

Fast forward to today. Took another test and I am still getting a faint positive line.

Could all of these test just be faulty?!