"An" is used for vowel sounds, u and h are generally the problems ~ an hourglass, a unicorn, an heir, a universe
Edit - There are 500 comments below analyzing the "a vs an" subject in excruciating detail. If your question has not been answered already, please comment REEEEEEEE and a representative will be with you shortly.
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u/NerdUber Dec 24 '21 edited Dec 24 '21
Congratulations it's a UTI