Myson - my thoughts are it could be either or a mixture. Apparently there is a water test, put it in a glass of water, semen will float and dissolve and EWCM will clump up and eventually sink. I have never tried it so I dont know. My thoughts are just check it every few hours, swirling your finger around your cervix to give you a better chance of getting CM rather than sperm. Another way of knowing is if your cervix is soft and open? My personal experience is that it is always open when EW is present.