I have had a tubal ligation 10 years ago. and I have never had more than a 35 day cycle and I am now 42 days from last cycle. I have had nausea, heartburn, frequent headaches, forgetfulness, and tired. I have taken two pregnancy test both came back negative. then just within the past hour I started to have cramping and have slight pink spotting when I wipe. Could I be Pregnant? Should I go to the Doctor?