There is always the chance of a tubal failure. Mother nature can and often does do wondrous things.
But, I must caution you that usually scar tissue in the fallopian tubes results in an ectopic pregnancy. It is not viable. The baby develops outside the uterus. In such a case, you can have severe pain and a great (possibly fatal) loss of blood.
See your ob/gyn if you are late. You can use a pregnancy test - use your first morning urine.