Yes, we've had such questions before. Here are the risks for hiv and the ONLY risks. The risks of HIV are if you have unprotected vaginal or anal sex or sharing IV needles to inject drugs. Air inactivates the virus.
So, in answer to your question. First, you speak in what if's and hypotheticals. Like what if another user before you had HIV ad peed on the toilet. What if the pee had blood in it. Your mind is spinning scenarios due to anxiety. Know that. This is an anxious mind at work making things up. Second, regardless of this fear mongering of your anxious brain, it is not a risk. NO ONE gets hiv from urinating in a public restroom. No one gets HIV from touching urine, with or without blood. You can't 'touch' ANYTHING and get HIV. Air is involved and inactivates the virus. No one has ever gotten hiv from something like you describe nor will they. Nor will you. It's an irrational concern once you understand how hiv works. And hiv does not transmit by surface exposures.
If you haven't had unprotected vaginal or anal sex or shared injection needles when using IV drugs, you never need to worry about hiv.