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This occurs rarely, may be due to re canalization of the ligated ends of the tube and is called contraception
failure. The failure rate of tubal ligation
is about 2 percent which translates into a risk of pregnancy occurring following tubal ligation of about 1 pregnancy in 1000 women who've undergone this procedure. An ultrasound
is to be done to confirm pregnancy, and to know the exact site of implantation
. This would give an idea if it is an ectopic pregnancy or not. Consult a gynecologist in this regard.