Hi ! Good evening. I am Dr Shareef answering your query. Even though the EPT could be negative, I would suggest you to go for a serum HCG estimation and an ultrasound of abdomen to confirm or rule out with certainty an unsuspected pregnancy. Apart from that an ultrasound would also give the treating doctor the latest information on your endometriosis. I would suggest you to anyway consult a gynaecologist for a clinical examination and related investigations for a definitive diagnosis, and further management. I hope this information would help you in discussing with your family physician/treating doctor in further management of your problem. Please do not hesitate to ask in case of any further doubts. Thanks for choosing health care magic to clear doubts on your health problems. Wishing you an early recovery. Dr Shareef