UTI after period?!!!

I'm so embarassed I legit don't know what to do, during my last two days it felt itchy down there so I drank a bit more water than I usually do but it didn't help because now... I'm off my period my boyfriend wants to have sex but we can't cuz I have a UTI. How do I get rid of it fast??? I don't want to douche (normally I do two days after my period but I didn't this time cuz of the uti) and mess my body up further.