Hello! Really needing advice. Did you have dark mucus??

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Hey ladies, I'm 38 weeks pregnant. I wiped after using the bathroom about a hour ago and there was dark red mucus. Not sure if it's my mucus plug, but there was no red or "fresh" blood on the tissue. I did have a membrane sweep on Monday at 11AM- could that have something to do with it? I'm a little crampy and baby is exceeding 10 kicks already within the hour.
I have called the hospital and they say to keep an eye out for it to see if I bleed heavy and monitor baby's movement. I'm a little crampy with BH.
Has anyone experienced something similar?