My cat got pregnant on the 16 of August and I don't know when she is due?:( help

Here is a site that can help you with your answers. Feline How-To Manual: Pregnancy and Delivery ~ Pawprints and Purrs, Inc.
It would be kind if you would consider spaying/neutering your pets. One cat usually has 3 litters of kittens per year. . Our shelters and streets are over run with cat and kittens. Each day cats are killed because there are not enough homes to go around. Besides that there are many health and behavioral benefits to spaying/neutering. Besides you will not have to put up with neighborhood males spraying to attract your female. As you know they will yowl and howl and fight with other males seeking her attention. Good luck