39% chance is the highest estimate?

Kristen • 28 YO, hubby 27 YO-Month 7 TTC - Month 6 using Clearblue Fertility Monitor - Tracking with Glow and Pink Pad apps
Anyone having the same percentage chance as their highest day for chance of getting pregnant? What kind of things play into this number? 
​Seems low? This is month 3 for TTC. Guess I thought chances were higher.