Don't mean to sound like a preaching dickhead, but that's really not a smart thing to do.
Piercings should, of course, be made with clean instruments (such as piercing pins or syringes) to minimize the risk of infection. I don't think this will be a problem, though. What really caught my eye was that you didn't say anything about the ring you put on your tongue. You didn't leave the safetypin on your tongue, did you. Cause that can be dangerous! And I mean dangerous. "Real" piercing jewels (rings etc.) are made of surgical steel, silver or titanium for a reason: they don't cause any allergic symptoms or irritate your skin. Safetypins are often made from pretty cheap metal, so they can have some pretty nasty stuff in them, that won't do any good dissolving in your mouth. I've seen an old piercing get infected in just a couple of days just because the ring got lost and was replaced with a cheap earring.
Piercings don't work like earrings. They become part of your boby in a whole different way. There's a lot to know about them, and if I were you, I'd leave that stuff to the professionals. Don't toy with them.
Don't get me wrong; I love piercings (getting one on my nipple this winter), but I've just seen too many fuck-ups. It's not pretty.
If you know this stuff already and don't care, it's ok. It's your body, after all.
Life is like an elephant: Big, gray and turns pink only by getting pretty friggin' drunk.