I just want to share this with anyone else who may have the same questions as I do, as I have been TTC for several cycles and I've hit my "fertile window" once again feeling somewhat doubtful with myself. This article is off of an app called Ovia that I just downloaded a week ago, so far a really love it! (But like I said, I still love Glow 😉) It answered a few of my questions and it gives a break down of every part of your cycle. Hopefully someone else can benefit from this, too :)