dried blood exposure to cut

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Hello, I've done some research through the site about exposure to dried blood coming in contact with fresh cuts and have read it's a zero risk situation to contract HIV, but I suppose assurance is everything.

3 months ago I was doing a photoshoot on location, a homeless man nearby offered the model a safety pin to hold a flower in her hair. She took it and used it. Nice gesture, nice guy. Fast forward....I later helped her remove the pin and got nicked by it, small cut, drew a thin layer of blood on my finger.  I then noticed the pin had red/brown stains all over it (possibly rust, but looked more like dried blood). This was on the outside edges of the pin, not on the sharp part that actually cut my skin.

but if the dried blood happened to be from an HIV+ person and it somehow came in contact with my pierced skin or somehow got into my bloodstream (the cut was very small), this is still a non-existent, zero-risk situation?  From what I've read I'm pretty clear testing is not necessary.  I had stopped thinking about it a while ago, but I just recently met a girl who I like a lot and before i engage in any sexual situations, I was reminded of the dried blood/pin incident and wanted to get more clarity before i do go further with her. Plus a week after the incident, I got a sinus infection/head cold that lasted a week. Probably not related, but you know, the mind connects things.

so yeah,  it was obviously still at the back of my mind since i started thinking about it again.  Rather be 100% clear so asking.

Thank you, apologies for a question you seem to receive quite a bit

[AnxiousNoMore]

This answers all of your HIV questions, and if you can think of any more just reread about the 3. You had zero risk therefore  testing is irrelevant to your situation because you had zero risk. HIV is a fragile virus, which is instantly inactivated in air and also in saliva which means it is effectively dead so it can't infect from touching, external rubbing or oral activities. It doesn't matter if you and they were actively bleeding or had cuts at the time either because the HIV is effectively dead.  
Only 3 adult risks are the following:
1. unprotected penetrating vaginal with a penis
2. unprotected penetrating anal sex with a penis
3. sharing hollow needles that you inject with.
The only way to get HIV is if you did one of the 3. The situation you describe is a long way from any of these 3.
Even with blood, lactation, cuts, rashes, burns, etc the air or the saliva does not allow inactivated virus to infect from touching, external rubbing or oral activities. Doctors have calculated the risk from what you describe to be less than that of being hit by a meteor, therefore no one will get HIV from what you did in the next 40 years of your life either. The above HIV science is 40 years old and very well established, so no detail that you can add to your encounter will change it from zero risk.

[GuitarRox]

Hopefully your research was clear that the HIV virus is inactivated in air.  So any blood on any pin would not contain the HIV virus. You get HIV from having unprotected vaginal or anal sex or sharing IV drug needles and that is all you would need to worry about.  No risk.

[Chima7]

I'm going to add my advice to the others to say that you had NO risk whatsoever from this. Dried blood (or fresh blood) outside the body is not a risk for HIV.