Our outdoor cat has ababdoned her 5 kittens when they were just 3 weeks. At the same time we realized there were male cats all around, which made us think she was in heat again. It's slready more than five days since she has disappeared and haven't returned even once to her kittens. Do we have any reason to worry about it? Is it possible that a cat in heat would leave her kittens for such a long time?