String of blood - dark red on underwear. 34 weeks preggo

So it’s my second child. Had stringy bright red mucousy blood on underwear. Super tiny amount but def there. So we went to ER just to be safe. Did pelvic exam with speculum and regular exam. They couldn’t find more blood which is great news and they said I was closed and not dilated. Is it possible this was some of my bloody show falling out?

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