Silly question , but…

I recently had the washer and dryer removed from my apartment, so now there is a hole in the wall where the dryer tubing connected to the outside. I’ve been paranoid that this opening would allow birds or bats to come into my apartment but was reassured by one of the maintenance people that this would not occur as the dryer vent is capped on the outside. Anywho, I came home the other evening and I felt like I saw something black fly through the doorway as I entered my front door. I’m worried that a bat got in through the dryer vent and then exited my apartment as I was walking through the front door. It’s also possible it was a shadow or a flying insect of some sort. If it was a bat, would it have been able to fly past me through my doorway without me realizing that it was a bat? I’m worried about bat contact due to rabies. Thanks in advance.