hi there, you may not be pregnant if the pregnancy
test is negative but as your doctor suggested you might be suffering from urinary tract infection
and that explains the cramps and pain near the uterus
region. You will need to get your urine examined for pus cell and RBCs and get a culture and sentivity done. According to the organism grown and the senstivity you will need to take a course of antibiotics. In the meanwhile you can take plenty of fluids in the form 0f water or juices and take syrup citralka to relieve you of the cramp. Take care.