A bit confused... Please help!!!

Yisel
So I had my AF ATHE 17th to the 19th... I checked my CM the 20th and it was watery which means fertile right? I BD that same night I than checked my CM a few minutes ago and it came out white looking and sticky not so much creamy... Is that normal? I'm so confused am I still fertile? My most fertile days due to glow are suppose to be between august 29th and the 3rd of September