As Curfew has said, the risk of an STI from this instance is so so low.
mPox - if he's vaccinated, or has previously had mPox, it's highly unlikely you would get it. There isn't really a way to test if you've got it or not unless you get lesions.
The only realistic risks are from the rimming, and that risk is VERY low for anything.
Gonorrhea: If you got gonorrhea, you might see symptoms like discharge and burning within 2-5 days. Not everyone gets symptoms.
Chlamydia: Oral chlamydia is not common, and she would have had to have oral chlamydia to give it to you. It could happen, but it is extremely unlikely. The symptoms and time frame are similar to gonorrhea.
You could get tested for both if you wait about a week after the encounter, but really, the risk is very low.
Syphilis is rare in developed countries, and your partner would have to have had a sore on his tongue to transmit it.
If you don't have oral herpes already (think cold sores), that is also a possibility, but again, VERY SLIM.
Sorry, I should add he never put me pebis in his mouth and his was never in mine.