 [ Symptoms ] i had a tubal ligation during my last c section is it possible that i am pregnant  what is the fail rate of my tubal since it was done during my c section [ Disease ] the probability of pregnancy after a postpartum tubal ligation during a c section or right after a vaginal delivery is 1 2 per 1000 procedures this means that your chance of becoming pregnant is extremely low but not impossible however if you do become pregnant you are at increased risk of having a tubal or ectopic pregnancy if you have missed a period you should perform a urine pregnancy test and if it positive see your doctor right away