You may have no symptoms, and you may never have known that you were pregnant.

http://www.patient.co.uk/health/ectopic-pregnancy-leaflet

What are the problems with an ectopic pregnancy?

A tubal ectopic pregnancy never survives. Possible outcomes include the following:

• The pregnancy often dies after a few days. About half of ectopic pregnancies probably end like this. You may have no symptoms, and you may never have known that you were pregnant. Sometimes there is slight pain and some vaginal bleeding like a miscarriage. Nothing further needs to be done if this occurs.