Thanks for the query.
According to your symptoms there is possibility for pregnancy
But as urine tests came negative even after 2 weeks of missed period the possibility is some what doubtful.
So you better go for blood test
for pregnancy and also ultrasound which will rule out the pregnancy and also can find out other causes of delayed periods like PCOD etc.
If your doctor recommends you can go for hemoglobin
profile etc which can also cause menstrual irregularities.