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Increased frequency of urination is a common occurrence during pregnancy
. It occurs as a result of uterine compression on the adjacent bladder.
Occasionally associated infections might set in leading to burning sensation of urine. It is good to know that you have undergone the test and everything is clear. In the absence of an active infection, I suggest you to try Syp. Citralka (sodium acid citrate solution).
Drinking plenty of water and cranberry juice can also benefit you.
Discuss with your gynecologist about these options.
Hope this answers your query.