Day 4 of 7 macrobid treatment for uti...burning resolved but frequency, urgency and low pelvic pain not improving at all ...should i go back to clinic?

Maybe: See if they did a culture. If the bacteria is sensitive to the antibiotic, you probably need to give the antibiotic more time. If no culture was done, get another urine test to see if your condition is improving.

Yes, if sx persist: 5-7 days is the usual treatment course for Macrobid and will resolve about 90% of uncomplicated utis. If symptoms persist another 24-72 hrs, would recommend that you have a follow-up urinalysis and urine culture and sensitivity test to make sure the UTI has been treated with the appropriate antibiotic and resolved and that another coexisting problem is not present.

Depends: It partly depends on whether you had a urine culture done. If you don't have fever, chills, etc. You might wait another day or two. Macrodantin (nitrofurantoin) doesn't work as fast as some other antibiotics, but it is usually very effective for uti's. If you had a culture done, your doctor can prescribe another antibiotic if necessary, that is specific for the type of bacteria causing the infection.