OPK / CM / Urine

When I have so it I noticed there was something while and gloopy floating on the top. It was massive! I showed my husband and he said that if I had been from my urine I would have felt it because of how big it was. I found something to put in the cup to move it so I could work out what I was. I was definitely thick white CM, I've never had this much of this white, it's normally more clear. 

Does anyone know what this means please?