Get an ultrasound
of whole abdomen, specially kidneys ureter and bladder, uterus and ovaries and pelvis.
That would settle the issue of pregnancy
If there is no pregnancy then a CT scan
of lower abdomen can also be done to see if there is an infected collection around the bladder or in pelvis.
Ultrasound and CT would also show the presence of endometriosis
Get a urine culture too.
All these will guide the future treatment .