If you are doubtful you should repeat the pregnancy
test. The urine pregnancy test is quite sensitive to detect pregnancy. When were you expecting your period and how many days has it delayed now?
Have you tried taking some pain killers to reduce the pain in abdomen that you are having?
you had previously was it an endometriotic cyst and is it still there? That could be the cause of your pain.
Do not be so anxious. See a gynecologist who will advise a few blood tests and ultrasound
to find the cause for your problem.
Till then you can take some mild pain killers to relieve the pain after you repeat the pregnancy test.