Faint line in a pregnancy test may be because of a false positive test or it can be because of a ectopic pregnancy which is common after tubal ligation. Also the possibility of a threatened miscarriage should be ruled out. Blood test like serum beta HCG levels and an ultrasound scan will make the diagnosis clear. Hope this helps.
Take care and good luck.
I had my last baby in 2005 when a month later I had my tubes tied. I have also had all obvious signs of pregancy this past week. A month + of missed period, Breasts firm and larger, hightened sence of smell, morning sickness, diahreah, visible baby bump, but... Negative pregnancy test, mauve colored spotting, back ache, head ache... ????
I am having similar symptoms right now. What was your outcome?