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Laziness
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A pregnant cat is likely to sleep more and shy away from spending time outdoors.
Affection--and Lack Thereof
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If you notice that your cat is being extra-loving with you, this could be a sign of pregnancy. Likewise, a loss of interest in male cats may be an indicator.
Hunger
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A cat who's pregnant is likely to eat much more than before, though her appetite will wane in the last few days of pregnancy.
Sickness
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Just like human beings, cats can get morning sickness when they're pregnant.
Physical Symptoms
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A pregnant cat's nipples will become enlarged and pink after about three weeks, and she'll be displaying considerable weight gain by the fourth week.
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