ALL homes have mold spores in them. Mold spores are literally everywhere at all times; it's nearly impossible to avoid them unless you are in a "clean room" they use to make electronics or do research. Something like 250,000 spores fit on the head of a pin...
Every mold culture test should grow something...
What you want to know is if there is any actively growing mold in the house; I think the only way to answer that is...
1. Through visual inspection of entire home, inside, out and attic
2. Test for hidden mold
Lots of ways to do #2
I think the best method is to close up your house completely for a few days when the humidity has been high and temps outside are 50-80 degrees. Once all of those conditions are met run a MVOC test.
MVOC tests look for microbial volatile organic compounds in the air. This is what mold releases that you smell and can contain other harmful chemicals.
Here is the only commercial product I know of to test this.
https://www.homeaircheck.com/our-products/voc-test
Like lfish has said; the exposure might not have been recently.
-David