Ovulation

Cassie • Momma of Three Graci 5-7-15 Graeson 9-7-16 Gabriel 8-6-19! Angel Momma of Two Nov 2015 and Twin B Jan 19 2016!
Im never quite sure when i ovulate and the signs arent very good such as cm its white for like a day but not very much is that normal?? Or is something wrong?? How much should you have around ovulation?? Help!!!