Hello, Thanks for writing in HCM. Urine test of pregnancy have 99% accuracy rate. If it is negative means your girl friend is not pregnant. Early pregnancy have many symptoms like Food cravings , Implantation bleeding or cramping , Fatigue Tender, swollen breasts , Morning sickness , A missed period, A positive home pregnancy test . Sexual intercourse is a common cause of urinary tract infections because the female anatomy can make women more prone to urinary tract infections. During sexual activity, bacteria in the vaginal area are sometimes massaged into the urethra. She can take a plenty of fluids i.e. about 3 liters water per day. She can do urine routine examination and urine culture and sensitivity test for confirmation of Urinary tract infection. After investigations if UTI confirmed, then she can take antibiotics. Wishing you a good health.