Hello Chances of pregnancy are always there with unprotected sex especially during fertile periods And as per details you have provided chances are enjoying still there for pregnancy Urine HCG pregnancy test may come negative as well due to low concentration or high dilution in urine If I were your treating doctor I would have advised you for an ultrasound to rule out pregnancy and at the same time to look for any obvious cause for symptoms you are having. Apart from USG you should go for urine culture and sensitivity test and a course of antibiotics if it comes positive, under supervision of your doctor Have plenty of fluids Avoid fried spicy and junk food, have lots of fresh fruits and vegetables Thanks for your question Regards