Hi @vanessa13!
Thanks for the question- looks like you’ve got some great answers! 
If you and/or the other person on fb heard the cat mostly while they were working spells, then I would suggest looking into magical ties. @CelestiaMoon shared some fantastic correspondences- you could also look into what cats mean in terms of spirit/power animals.
However, simply hearing a loud cat outside from time to time during this season likely means what others have pointed out- kitten season is fast approaching! 
Blessed be!