I was picking out weeds (very tall ones) until something with 2 tiny fangs bit me?

It was probably some sort of insect. Has the bite swollen and are you in pain? If not you'll probably be okay - just keep an eye on it, and if things change then go and see someone. In the meantime, dab the wound with antiseptic to kill any potential infection, wrap a clean elastoplast around it. Should sort itself out soon. A word of advice ... next time wear gardening gloves!