"...the cat gestation period is generally stated as being somewhere between 61 and 69 days long (NOTE - I have seen feline gestation period figures as short as 56 days right through to as long as 72 days), with an average of 63 to 66 days. " http://www.pet-informed-veterinary-advice-online.com/cat-gestation-period.html
Soon your whole city will be full of cats.
well, I have to prepare my heart for it :D
You will also need to prepare your neighbors for the plague you are bringing upon them.