The first abnormal signs of an ectopic or tubal pregnancy include pain in the abdomen or pelvis and light vaginal bleeding, according to Mayo Clinic. Some women experience shoulder pain or the urge to have a bowel movement if blood leaks from the fallopian tubes.
The initial symptoms of a tubal or ectopic pregnancy are often similar to those associated with a normal pregnancy, including nausea, breast tenderness and a missed period, explains Mayo Clinic. A pregnancy test shows a positive result. The additional symptoms that signal a problem begin as the embryo begins growing in the fallopian tube. If a doctor doesn't discover the ectopic pregnancy soon enough, the fallopian tube can rupture, causing heavy bleeding, light-headedness, shock and fainting.