Mucinex and old period blood

So I just had a cold and was taking Mucinex all while on my period. And normally when I start there's old blood which is normal. But while taking Mucinex and my period ending I feel like it's making/helping get all the old blood out. My period ended 3 days ago and I'm still getting what looks like old blood along with cm.

Have any of you experienced this?

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