On one of my breeding lists, someone posted that a mom had only one kitten and within a couple days was already calling....so it can be very quick.
You may notice your male will soon practice mating with the girls. He will bite their necks and mount them; they will howl. He is not capable of fertilization at 12 weeks, but I have heard of some males who have been confirmed fathers as young as 4.5 months. There are ways of telling when a male is capable of fertilization, but this is a family-friendly-forum.
...Always in my heart... Mocha....Nov. 13, 2002 - Dec. 6, 2013
.... Slave to Bengal Cats....Luna, Mystik, Simba, Komet, Meli,
Spark, and Star
.....and a collection of kittens at various times.