No, do not take more of these AB. There are many strands of UTI and different ABs work on different strands. If your AB has not kicked in by now, it is a wrong one. There are two approaches: trial and error of different ABs or taking a culture test, waiting for the results and then getting tthe right AB prescribed. The latter approach usually gives results in a shorter time, hence I recommend it. Untreated or incorrectly treated UTIs can and do lead to extremely, outrageously painful kidney infections, with almost unbearable pain. Please go to urgent care clinic tomorrow morning and request a culture test. I know it is expensive. My cliic gives me thirty percent off for my being without insurance. Ask yours. Do drink ocean spray cranberry juice and do eat many many portions of live culture yogurt a day. Good luck and keep us posted. Do not delay!!!