Normal Cycle? TTC for 2 months.

I’ve just recently started using Glow, I’ve been using another app for about a year now to track af and it’s gotten pretty spot on. I’ve noticed that my cycles have gotten a lot shorter than they used to be. This past month (July) I started spotting on Thursday, af started on Friday, by Saturday it was really light and going away and by Sunday all I had was spotting. This is extremely short compared to how they used to be. Any advice or comments?! I’m so new to all of this!