4.5 days is a bit early to test, but oral sex is a lot lower risk than unprotected vaginal or anal sex.
How long ago did you use the harsh soaps (which do nothing to prevent infection, by the way)? Stop using those, drink plenty of water, give it the weekend, and if you are still feeling any burning, retest next week.
Harsh soaps aren't any better at killing things than gentle cleansers, and you only need to use a harsh soap if you have grease or something on your body. You can use a gentle, non-soap cleanser on your genitals daily and be as clean as you need to be.
Is this level of anxiety normal for you?