Confusing Cycle

Apparently my fertile week on pink pad was from jan 1-7 but on ovia it was dec 27-jan 3. I've been trying to pay attention to my cm which around the 28th was ewcm. I didn't have any egg white cm during my apparent fertile period for pink pad, just white thick cm and now it seems like I am having ewcm again, except this time it has a white tint to it and seems a lot more stretchy. Any thoughts ??