Kindly refer to the following link https://www.assimalhakeem.net/purification-and-prayer-for-one-who-has-urinary-incontinence-i-feel-that-some-drops-of-urine-come-out-i-asked-about-prayer-and-i-was-told-to-do-wudoo-at-the-time-of-each-prayer-and-then-pray/

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If you started the prayer while imam was standing, you must complete the Fatiha. Otherwise, your Rakah would not be complete. If the imam raises his head before you go for ruku, this Rakah is void and you must add another Rakah after the imam gives Salam.

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Which part of your awrah are you referring to? If it is the hair, simply fixed it and continue your prayer as exposing it a bit like this unintentionally is ok.

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