Another CM question, a little tmi

I have minimal cm so it never matches the pictures I see of fertile cm. I'm hoping I'm not alone and can get a little help. Every once in a while I get a little white residue on my undies, yes I said undies ?, could that be a sign of  fertile cm? At the same time I do a check and it's really watery but doesn't stretch. 
Ok, that was akward to type out. Any insight will be really appreciated!