What Causes Sharp Pain In Abdomen Along With Burning Sensation During Urination?

I have been given Macrobid saying I have bladder infection. When results came back I was told I did not have bladder infection but to continue with the Macrobid. I still cannot urinate as it causes burning pain. I have been on medication for 3 days, I am also experiencing sharp pains in my right side. Should this medication have worked after three days of intake