How Can I Tell If My Cat Is Pregnant, and When Are the Kittens Due?

A pregnant cat shows her first clear sign at around three weeks after mating, when her nipples swell and turn a deeper pink. Weight gain, a rounder belly and a bigger appetite follow from week five, and the whole pregnancy lasts roughly nine weeks, or 63 to 67 days.

That is the short answer. The longer one matters more, because most cat pregnancies are not planned. A young female slips out one evening in spring, comes home a little too pleased with herself, and nobody thinks about it again until her shape changes. Cats can conceive from around four months old, long before many people have booked the neutering appointment.

What are the first signs a cat is pregnant?

The first sign of cat pregnancy is "pinking up": the nipples enlarge and turn a rosier pink from about day 15 to 21 after mating. Heat cycles stop at the same time. Before three weeks there is usually nothing to see at all.

The change is subtle on a cat who has had kittens before and far more obvious on a first-time mother. Part the fur on her belly in good light and compare against how she looked a month ago.

The other early clue is behaviour. A queen (the proper word for a breeding female) who was yowling, rolling and presenting her rear end every few weeks suddenly goes quiet. Some cats become clingier. A few go off their food for a day or two in week four, the feline version of morning sickness.

None of these on its own proves anything. Together, roughly three weeks after a night out, they add up.

When can a vet confirm that a cat is pregnant?

A vet can confirm cat pregnancy by ultrasound from about day 15 to 21 after mating, by gently feeling the abdomen from around day 21 to 28, and by X-ray from about day 42, once the kittens' skeletons have hardened enough to show.

Each method tells you something different, so the timing of the visit matters.

Method	Earliest reliable point	What it tells you
Ultrasound scan	Around day 15 to 21	Confirms pregnancy, shows heartbeats, poor at counting
Palpation (feeling the belly)	Around day 21 to 28	Confirms pregnancy, rough idea of number
X-ray	From about day 42	The most accurate kitten count

Do not feel for kittens yourself. Untrained hands can damage the embryos, and from week four stop scooping her up by the middle. One hand under the chest, one under the back end, or let her come to you.

If you have no idea when she mated, the vet can estimate how far along she is from the size of the foetuses on the scan.

How long is a cat pregnant?

Cats are pregnant for 63 to 65 days on average, with most litters arriving between day 63 and day 67 after mating. Anything from about 60 to 70 days can still be normal, and the count begins at mating rather than at the first visible sign.

Nine weeks sounds like a long time. It is not. By the time most people notice, she is already a third of the way through.

Litter size averages four kittens. First-time mothers and older queens tend towards smaller litters, and a single litter can have more than one father if she mated with several toms during the same heat.

How do I work out my cat's due date?

Count 63 days forward from the mating date to find the earliest likely due date, then add a window of four more days. A cat mated on 1 March has a due date of about 3 May, with kittens most likely between 3 and 7 May.

If she was out for several nights, count from the first, because the earliest mating usually sets the clock.

A calculator does the counting for you. If you know roughly when she mated, you can work out your cat's likely due date from the mating date, see which week of gestation the queen is in now, and match her nipples, appetite and belly against a week-by-week guide. Treat the birth window as a planning tool, not a promise.

And if the mating date is a complete unknown? Work backwards from the signs. Pinking up means at least three weeks in. A visibly rounded belly puts her past week five. Kittens you can feel moving mean week seven, with a fortnight or so to go.

What does cat pregnancy look like week by week?

Cat pregnancy has almost no outward signs in weeks one and two, pink nipples in week three, appetite changes in week four, a rounding belly from week five, visible kitten movement by week seven, and nesting behaviour in the final two weeks before birth.

Weeks one and two are invisible. Fertilisation happens, the embryos implant in the womb, and she carries on exactly as before.

Week three is pinking up. Week four brings the queasy stage for some cats, and the point where the vet can feel the pregnancy.

Weeks five and six are where she starts to look pregnant rather than well fed. Her belly rounds out, her appetite climbs, and this is the moment to switch her to a kitten or growth diet, which she stays on until the kittens are weaned. Feed little and often, because a womb full of kittens leaves less room for a full stomach.

Week seven is the reveal. Her sides are clearly rounded and, with a hand resting on her flank, you may feel the kittens shift. Week eight brings prominent nipples, a first drop of milk in some queens, and a sudden interest in wardrobes and the back of the airing cupboard.

Week nine is nesting in earnest. She eats less, paces, grooms her belly and settles into the spot she has chosen. Birth is close.

Could the signs mean something other than pregnancy?

A swollen belly and pink nipples do not always mean kittens. False pregnancy, worms, simple weight gain and, most seriously, pyometra (an infected womb) can all mimic a pregnancy. Pyometra needs same-day veterinary treatment, so an unspayed cat with a swelling belly should always be checked.

False pregnancy is uncommon in cats but does happen. A heat cycle where she ovulated but did not conceive can produce pink nipples and even some nesting, then fade within a few weeks.

The one not to gamble on is pyometra. A queen who is drinking far more than usual, off her food, lethargic, or has any discharge from her vulva is showing infection signs, not pregnancy signs, and the condition can kill within days. The same ultrasound that confirms a pregnancy rules this out, which is a second good reason to book it.

What should I prepare before the kittens arrive?

Prepare a nesting box, a growth diet, a quiet room and your vet's out-of-hours number by week seven. International Cat Care advises that nesting behaviour usually starts in the final two weeks of pregnancy, so the box needs to exist before she goes looking for one.

The box itself is simple. A large cardboard box with a doorway cut into one side, lined with newspaper and old towels you are happy to throw away, placed somewhere warm, dark and away from other pets and children. Show it to her, then leave her to decide. Cats often ignore the lovely box and choose a laundry basket, so keep a second option open.

Keep her indoors from week eight. A queen who gives birth outside is a queen you cannot help if something goes wrong, and staying in also stops her mating again, which she can do within days of the birth.

Have clean towels, blunt scissors, unflavoured dental floss for tying a cord if needed, and a hot water bottle wrapped in a towel. Most of it will never leave the cupboard. That is the point.

When should I worry during a cat pregnancy?

Contact a vet during cat pregnancy if the queen has any bloody or green discharge before labour, stops eating for more than 24 hours, vomits repeatedly, drinks excessively, or goes past day 70 with no sign of labour. During the birth itself, straining hard for 30 minutes with no kitten is an emergency.

Most cat pregnancies need nothing more from you than good food, a safe place and a watchful eye. The queen does the rest.

But keep the calendar. Knowing she mated on a Tuesday in March, and so that the first week of May is the week to cancel your plans, is the most useful thing you carry through those nine weeks.