test could be false negative as sometimes the level of HCG
hormone is less and undetected by the pregnancy test.
Get your urine test for pregnancy done again after 4 to 5 days and specially the early morning urine sample as it contains the maximum concentration of HCG hormone.
You may also get the blood HCG test done to confirm the pregnancy.
If pregnancy is found to be absent in further couple of times at 4 to 5 days interval,then you may not be having pregnancy.
If it is not there,then don't loose hope as you shall definitely get pregnant if you show patience.
Keep on taking the treatment regularly.
Most important part of he treatment is keeping your weight normal in your required BMI range.
If you are overweight
,then even a 10% reduction of weight makes you fertile and get regular periods.