Mucous plug lost/losing?? Tmi

Me and my boyfriend started to fool around and I noticed on the bed something wet and coloured, but it was the heat of the moment and it lead to us having sex and we didn't want to stop so we carried on, but I'm not sure if it is some of my mucous plug or not and its definitely not from anywhere else but I'm really uncertain as to what it could be its a weird brown colour 👀 I'm nearly 37 weeks, crampy and achy