So confused ๐Ÿ˜ Help please ๐Ÿ™๐Ÿป

Iโ€™m currently 8 DPO confirmed with OPKโ€™s. All of a sudden after having creamy cm, Iโ€™m having watery and even eggwhite cm today. I took an OPK and Iโ€™m definitely not having another surge.

Why am I having fertile cm?