Keyona
only medicine I can think of is a good twist on her neck, will shut her up, and end her pain she will face with being bred and giving birth.
Really though if your parents are willing to put in the work for the cat she really should be taken to a shelter.
File under: NOT A SOLUTION. Jesus Christ, I'm honestly surprised to see you say such a thing.
Okay, let's try to get this cat some help. First, a few questions that may help us help you. Why do you think that your cat is within three weeks of having her kittens? How sure are you about due dates? Do you have a regular veterinarian, and has your regular vet or any vet at all examined the cat since you determined she was pregnant? Has the cat shown any nesting behaviour, and have you provided her with a choice of safe nesting spaces for her to have her babies?
Next, let's get to some questions to try and narrow down what's going on with your cat. How do you feed the cat? I don't care about what kind of food (actually, changed my mind. I do care about that. What has the cat been eating?), but I do care about whether you free-feed her or feed her on a regularly scheduled time per day. How much is the cat eating per day? Have you noticed any changes in how much the cat eats every day?
Water. Where does the cat get her water supply? Have you noticed a change in how much she's drinking?
Because it's an outdoor cat, this may be a stretch, but have you noticed that the cat has bathroom problems (straining to pee/poop, using the bathroom in unexpected or unusual places)? Have you noticed a change in the cat's activity (she spends more time laying down, she lays down in different places than usual, she's way more active than usual, she's more aggressive than usual)?
If the answer to most of these questions is "I don't know but the cat is still meowing constantly", then try to convince your parents to take the cat to a vet. A cat that suddenly starts meowing constantly is a cat that is trying to alert you to something that is wrong.
If your parents are too cheap to take the cat to a vet (and please do really try to convince them. If you're going to own the pet, they need to understand that it will sometimes need veterinary care. This is like Pet Ownership 101), then you could try calling around to local shelters or vets. Explain the situation, explain that the cat is pregnant, explain that you don't know what to do about the kittens (I'm supposing that you don't have homes lined up for them?), and ask if their vets will provide help. A lot of shelters have vets on call, and some may do free work for people (AKA concerned teens whose parents won't provide the money) to possibly save the kittens' lives. This is a long shot, but some shelters do help people out this way. The shelter will likely want to take control of the kittens, and may even want to take control of the cat. If I'm honest with you, surrendering the cat to a no-kill shelter is the surest way to be positive that both cat and kittens get vet care if your parents won't pay. That's not a great reality, but it's what we live with.
As far as medicines to help the problem, Feliway may calm a cat that's meowing because she's a little freaked out about the changes that are taking place to her body due to pregnancy. But Feliway is a bit expensive, and if you have money to throw around on treatments that may/may not help which are recommended by people on the internet, then it's better you spend that money on taking the cat to a vet. Bottom line as far as I'm concerned is: vet care. Get some.
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