The chances of a failed tubal ligation
increase progressively as years pass by, yet they are negligible. In case of pregnancy
in a failed tubal ligation, chances of an ectopic pregnancy are higher. The cause of spotting after intercourse could be due to local lesions and is better explained after a local examination by a specialist; with a vaginal swab and a pap smear
. You may exclude pregnancy by a HPT and a sonogram if needed. Please get further suggestions from your doctor. Good luck.