I am 27 years old, I had a tubal ligation about a year ago about 6 weeks after having my 2nd child. I have had regular menstual cycles, 29 days long. I am a 8 days late and I took a ClearBlue digital test yesterday and it said "Not Pregnant." What are the chances that I'm still pregnant, if I took a test at one week late? Should I take another test? If so, when? Should I call my doctor?