I think you need to let a doctor see it, and if he thinks herpes or syphilis (which would be from another encounter, not this one - it showed too soon), then insist on a culture and blood testing.
Aj
by the way this happened about 3 days ago
Thank you so much.. Well i am getting tested tomorrow just in case... if anything do you think its too soon?
No syphilis would not show that quickly and you would have to come into direct contact with a syphilis sore.
Do not apply anything to it, but it doesn't sound like an STD. I would see a Dr but I would not worry about it.