Pesticides in house with baby

Hi guys I’m a ftm and my son will be 15 weeks tomorrow! Anyways we just moved into a new apartment last week that also already had a flea infestation— they sent someone to spray when I wasn’t home(don’t know what company or chemical was used) but now I’m stressing for my little- I don’t know where they sprayed or if they were careful and I’m seriously stressing- I feel like I can’t touch anything in the house for fear of getting residue on my baby. I feel like an awful mom for not thinking of this all before hand- only thing they told me was to be gone from the apartment for 2 hours but I stayed gone for 4. Advice? Experience? Please help ):