If he hasn’t had symptoms, then it is likely he will test negative. I had a bad case and tested positive and then again on Day 6. Finally tested negative on Day 8 (I think?). DH tested negative on all home tests but got a positive PCR on my Day 6 or 7. He didn’t have symptoms and had negative home tests that straddled the PCR. I think he had the virus but never developed a full-fledged case (maybe because he had an extra booster).
Both of our kids have been fine.
Hopefully your DS was just a “carrier” briefly and will be in the clear tomorrow.
DS '04 "Boogaboo"
DD '08 "Lilybear"