Questions like yours have been answered repeatedly on this site by the community and by the experts. Believe those answers; they are accurate.
No std would cause symptoms within hours. It would take at least 2 days before onset of any symptoms. Your symptoms are probably due to trauma caused during the encounter or maybe even an allergic reaction to the lubrication or condom.
Additionally, unprotected oral sex is safe sex. Not completely risk free, but much much safer than unprotected vaginal or anal sex. Protected oral sex, even with condom slippage as you describe, is for all intents and purposes, risk free. You did not catch anything from the encounter that you describe. I don't like to ever say "never", but the odds would be exceedingly low, like one in a million. It's just not likely.