Signs from body for fertile week

What are some signs from that your body tells you when it is your fertile week?

I know everyone is different but I would love to hear everyone’s perspectives.

Change of CM, for sure!

(I missed my fertile week this month by depending on my apps which I’ve learned my lesson)

Any tips for this not happening again? I ended up ovulating early and figured it out by opk strips! (It’s hard to judge by those when you are actually entering the fertile week - only when is your actual peak is)

Help, y’all!