Pregnant cats (called queens) can be spayed, but the decision depends on a number of factors, which you should discuss with your veterinarian and your family. Spaying a pregnant cat terminates the pregnancy, making this a controversial issue. Some people cannot bear the thought of killing fetal kittens.
It is possible and it is done all the time. It requires a conversation and exam by your vet first to exactly determine if she is 4 weeks. It is sad because obviously when the uterus is removed, the fetal kittens inside in their sacs are also removed, and of course they cannot survive outside the mother and they are not yet developed enough to live. However, since the pregnant cat is anesthetized, the fetuses are too. They do not feel pain or distress or even have any awareness, as far as we know, and they are just separated from the mother's “life support” without ever being born.
It is a bigger risk and more detailed surgery than a spaying. When spaying it is a small 1 inch incision on the belly. With a pregnancy of 2 weeks and more it involves a larger opening in order to remove the large uterus Y tube and kittens. The more kittens and later in the pregnancy the more in depth.
Yes they can be sprayed, but if the cat is more than half way through her pregnancy your vet may charge a per-minute rate for the surgery rather than the standard cat spay rate, because the vet will have to take longer tying off the blood vessels, which are much larger than when the cat is not pregnant. Also the cat may end up with a longer surgical incision which requires more sutures to close it.
In my opinion it’s not a good idea!!!! The surgery will put way to much stress on the cat and kittens. Why would you want to do that anyway????? The recovery time for the cat will be twice as long as well. Can you imagine getting cut open in your belly and not getting anything for pain????? Why can’t you wait until the kittens are born???? Personally, I would Never even consider doing something like that!
Many dogs and cats are spayed while pregnant to prevent the birth of puppies or kittens. A veterinarian will examine the pregnant dog or cat and stage of pregnancy, before deciding whether she can be safely spayed.