Is it that the puck Nuvaring flattens in the vagina, affects its effectiveness?

To @Goska1111:

Yes, the medical rubber from which NuvaRing is made adapts to the shape and size of the vagina. Changes in body weight, such as losing weight or gaining muscle, should not affect its effectiveness or ability to hold properly in the vagina, as the ring is not dependent on these factors.

So this rubber rather adapts to the vagina in the ring?
Even when I put it on and after a month I lost weight? Or gained muscle?

To @Goska1111:

Long nails do not affect the effectiveness of contraceptive rings, because their action is based on the release of hormones into the body, not on the mechanics of application. In terms of body variations, most discs are a standard size and effective regardless of body weight, but if you are more weight, a different contraceptive method may be considered, depending on your doctor's indications. It is worth consulting a gynaecologist to choose the most appropriate method.

What if I have long nails and scratch it? Does it not affect the effectiveness?
Are all the pucks the same size? Do women who are bulkier have the same discs as the smaller ones?