have symptoms of headache, lower abdominal pain, back pain, fatigue, nausea, breast tenderness, nipple pain, 17 days late period, and a pregnancy test with 1 line. I went to the hospital and they also tested with 1 line. The doctor said I was not pregnant after an ultrasound. The doctor told me to come back to the hospital after 1 week. Doctor, can you tell me if I have lower abdominal pain, nausea, and late period, am I pregnant? Sometimes I have severe pain on my right side. Is it dangerous, doctor? If I am not pregnant, what disease are these symptoms caused by? Thank you, doctor.