Pain around the belly button could be due to many causes like gas (trapped air), initial stages of appendicitis
, any gastro intestinal infection, urinary tract infection
, ovulation pain etc.
Hence the doctor must have advised a urine routine , blood test
as all these investigations will help rule out the above mentioned possibilities including any problem in the uterus/ovaries etc.
Meanwhile, I would suggest that you drink plenty of fluids a day , at least 8- 10 glasses of water a day.
Hope this helps. Get well soon.
Dr. Divya Kuttikrishnan