If you are bleeding and not cramping and you are coming up positive for a pregnancy, you might have one. If you have pain on your side, you need to confirm it is not an ectopic, it could also be a luteal cyst or something else. Ectopic can be VERY dangerous, life threatening, so if you suspect it you should confirm. They can not see or find he ectopic unless you are a few weeks pregnant though. Why do you suspect one?