Hi ! Urine pregnancy
test is not always a confirmatory test for pregnancy. Discuss it with your family physician who may advise you for a serum HCG
test followed by an ultrasound
if need be to exclude a pregnancy.
The symptom what you have could also be due a pelvic inflammatory disease
, and to exclude this you have to get yourself examined by a gynaecologist who can advise on the treatment.
Wishing you an early recovery.