My training as a coach was that there is always a possibility for blood born pathogens on contact with blood. I have Hep C and it is the number 1 infectious disease. according to the CDC. I won't have my nails done publicly because it is easy to transfer and hard to just wipe off. NOt to freak you out but I hope you washed with soap and water for at least 3 versions of happy birthday. Only blood work will tell in time. Hopefully it is nothing. I always wear gloves on all blood accidents from little children, bloody noses or injuries. Carry them in my car and have one in my purse in a baggie. Some might think over reacting...I teach health and I say PREVENTION!
I would get an HIV test just to be safe. The Health Dept. does these for free.