OPK advice??

Amanda • 31 Years Old - TTC for going on 2 Years - 1 👼🏻 - Wishin` and Hopin`
Wanting to perfect my TTC routine! My cycles are any where from 26-30 days. 3-4 day periods. Any ladies with similar cycle have any input on when to test? Internet says too many contradicting answers, hoping for a 2015 updated answer! 😊 Thanks in advance!