Yellow discharge, has my cat's labour started?

hi my cat is pregnent and she has yellow discharge is that a sign of her haveing the kittens

It could be the mucus plug or her water breaking.  Has she had any kittens yet?
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My cat had discharge and I could see her contracting for two and a half days before she had her kittens. Just keep an eye on her and look for other signs. Has she been nesting? A lot of people say that cats won't want to eat when they're close to giving birth, but my little one ate in between kittens.