Fertil cm

I’ve been trying to check my CM. I’m on birth control and am in no way trying to have a baby right now. How come sometimes after sex or just fooling around my CM looks clear and stretchy like fertil cm is supposed to look. During the hours though when I’m not wet as you would call it though it’s the milky white non fertil cm.

Does that mean I ovulated if it’s clear after sex or just messing around. Or is that just what happens when you get wet?