38 weeks and burning in my woo ha

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I woke up from a nap and went to pee and like ten minutes later my vag felt like it was burning. Now it's like a dull burning feeling. Is that probably a uti? I have never had one. Do I need to contact my ob or go to a walk in or is it an emergency or can it wait until tomorrow as its late now? I don't have fever or chills at all.