An ectopic pregnancy may cause shoulder tip pain. This may feel like a sudden, strange pain just between your shoulder and arm. This serious cause of shoulder pain in pregnancy actually happens because there is bleeding in the abdomen
Shoulder tip pain - shoulder tip pain is felt where your shoulder ends and your arm begins. It is not known exactly why shoulder tip pain occurs, but it usually occurs when you are lying down and is a sign that the ectopic pregnancy is causing internal bleeding.