Hi. Thanks for your query and history. You look to be worried too much as the tubal pregnancy is rare , do not worry . But the commonest cause of pain in the lower abdomen where it hurts even for the movement, coughing and sometimes walking indicate that you have peritonitis. I would advise you the following: First all get admitted to get proper treatment started, get all the tests of blood, urine done. Urgent ultrasonography to decide what is inside. Blood group is surgery is needed. The probable causes can be appendicitis / Ovarian problems ( in spite you are on implanon), Salpingitis, severe PID , perforated intestines , diverticulitis... nce the diagnosis has been made, you have to undergo the further medical or surgical tests as needed.