As your queen nears her time for giving birth, she will exhibit a few signs that will give you clues to the impending arrival of kittens. The first stage of labor lasts from 12 to 24 hours, and may include the following "symptoms."
Nesting. She may start snooping around in closets and secluded areas for an appropriate place to bear her kittens. The time is ripe for you to prepare an area for her in a private place, with a box or basket lined with soft towels. She may decide instead to give birth on the cold, hard floor of your bathroom, but at least you have tried to accomodate her needs.
Increased affection. She may suddenly become very loving, and want to be near you at all times. Don't be surprised though, if a previously affectionate cat becomes withdrawn and seeks solitude. Either personality change may be completely normal.
Decreased Activity. Queenie may decide she'd rather sleep most of the time. She may also lose interest in food.
Milk Discharge from Nipples. Your cat's nipples will have become enlarged and pink about the third week of pregnancy; 24 hours or so before birth, she may show a milky discharge. This discharge may come even earlier in cats that have given birth several times.
Drop in Temperature. The normal temperature in cats is between 100.4F and 102.5° F. A dramatic drop in her rectal temperature is a sure indicator that birth is imminent