If your cat has not been spayed and you think that she may have become pregnant there are a few things that you can look out for.
The first sign that you should look out for is your cat coming into heat. This can happen as early as four months old, although the first instance is usually from six to twelve months. It can occur as often as every three to four weeks. Generally during the warmer months there will be more occurrences.
A cat in heat will display certain symptoms, including urinating against objects to spread her scent, which will let any male cats in the area know that she is ready for mating. The urine from a cat in heat usually smells stronger than normal due to the increased levels of oestrogen.
She will probably become more affectionate, rubbing herself up against objects, other animals and people.
She may start calling, this is a long howl that calls attention to the fact that she is in heat. Any unneutered male cats in the area will seek her out.
She may also go into the mating position a lot, with her rear end raised in the air and her tail upright.
These symptoms will carry on while she is in heat. If she does come into contact with an unneutered male while in heat, then she will mate and she will more than likely become pregnant. It is also possible that a cat may become pregnant by more than one father, this can explain the difference in colourings and patterns in the kittens.
For the first three weeks of a cats pregnancy , it is quite hard to tell that she is pregnant. There are some signs that you can look out for. She could have an increased appetite and show some signs of weight gain, her nipples may become swollen, she is likely to become more loving towards you and she may also start to get morning sickness. From around the fourth week of the cats pregnancy a vet should be able to confirm she is pregnant by feeling around the cats abdomen.
Giving proper care to your pregnant cat will help towards a healthy litter of kittens. A few things you can do to help are to ensure that she is receiving a proper diet full of nutrition and prepare a nesting area ready for when she is close to having the kittens.
The majority of cats handle pregnancy and labour extremely well and there are not usually any major complications. It is always best to have a number for a vet close by though in case of an emergency.
Read more about pregnant cats and how to care for your cat during pregnancy and labour at Pregnant Cat.