Landlord gave wrong date on time that the apartment was gonna be sprayed. Pest control came in while pregnant gf was asleep and sprayed

You clearly need to document the event with as many details as possible.  If you can get a copy of the work order and invoce , then do so.  File an incident report with the landlord and keep a copy. Then, you need to wait to see if your girlfiend or her child develope any medical issues related to the pestifice exposure. While you can certainly prove negligence, right now you cannoy provide an injury caused by the spraying. Regretfully, you are in a hurry-up-and-wait mode...