Fertile days TMI!

Okay guys i have more then one period tracker as i have irregular cycles and the other two i have downloaded assist with irregular cycles, i just wanna know when my most fertile days are? AF came 2 days ago im in CD3 and my CM is clear and stretchy but its really light and only when i wipe up abit, and when i dont have my period its creamy and lately its only been clear and stretchy at night time when i go to pee before bed. Need answers please ladies! I dont have a heavy flow, but more light and only there when i wipe it goes from medium to light..