[header] How to recognize and treat an ectopic pregnancy [title] Note vaginal bleeding. [step] Abnormal vaginal bleeding is often one of the first symptoms of an ectopic pregnancy. This bleeding may be either heavier or lighter than what you normally experience during your menstrual period. 
It may also be accompanied by severe pelvic or abdominal pain. [substeps] If you experience vaginal bleeding when you know you are pregnant, or if the vaginal bleeding is accompanied by severe pain or lightheadedness, seek medical attention right away.