Abdominal pain and vaginal bleeding are the most common signs.
Symptoms of an ectopic pregnancy include abdominal pain and bleeding, usually (though not always) in the first trimester. However, this can also happen in completely normal pregnancies, as well as in miscarriages, so it is sometimes hard to know what is going on.
If you are having pain that is severe or accompanied by vomiting, you should seek immediate care. Also, if your bleeding is heavy (or if you soak a pad in one hour for two hours straight, or enough that you feel dizzy) you should also be seen right away. When you are seen, you’ll have some blood work done, as well as an ultrasound to check on the pregnancy and to determine if it could be an ectopic pregnancy.