Urinary tract infection after sex, what should I do?

hello, i've had unprotected sex a few days ago with a new partner. i felt pain even during sex because my vagina was dry at the beginning. I think I got UTI since i have these symptoms: -burning with urination -increased frequency of urination without passing much urine -increased urgency of urination i also found something on my vulva - on one side - if you can see it on the pics - is my vagina just hurt/irritated thanks to kinda rough sex or is it something else? thank you all for your answers

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It seems that it has just been irritated. I suggest to monitor it for a few days and see if the irritation disappears or it further develops.