I had my last period on dec 10 ,2015 and skip my January periods I went to my obgyn she did ultrasound in her office and advice me to terminate pregnancy coz she said there is no heart beat in embryo she gave me 2 choices D & C and vaginal tablets I ask for vaginal tablet then she gave me misoprostol in her office but I did not get bleeding with that she ask for another ultrasound and then she told me it's an ectopic pregnancy on uterine scar and she ask for ultrasound every second week and hcg hormone analysis weekly now its been more than 18 weeks but I'm still having gestational sac on uterine scar what are the complications to keep it for such a long time inside my uterus plz let me know in details coz I've been suffering severe pain in all 4 limbs and in my chest and diaphragm area does it related to my condition or what complcation can I suffer with this condition