My monitor prompted me to test this morning. And today is CD9 and I am at Low fertility. Exactly what I would expect at this time in my cycle. If you aren't sure what I mean by monitor. I will explain. I use a Clearblue Easy Fertility Monitor.
This little contraption is genius. It detects rises in TWO hormones during the menstrual cycle. Luteinizing hormone and estrogen. Estrogen increases the closer that a woman gets to ovulation. When a high level of estrogen is detected the monitor will switch from saying "low" to "high" fertility. LH increases when ovulation is imminent. When a high level of LH is detected, the monitor will switch from "high" to "peak" fertility. When I see peak fertility, I will call the office and have my IUI the next day.
The monitor also has a built-in computer. It keeps track of your cycles over months or years and will prompt you to test whenever it thinks that you are getting close. For example, earlier on in my monitor usage, it had me test on CD7. Now that it knows that I am a late ovulator, it waits until CD 9 to have me start testing.
The monitor is kinda pricey, however, worth it! It takes all the guesswork out of the equation. No more going blind from trying to read ovulation sticks. :) Plus it lasts forever! I have been using this since we were trying to get pregnant the first time.
Granted, I pretty much know when I am ovulating anyway. I am a pro at this, afterall. I feel a twinge and know that I just popped out an egg. When you have been trying a long time, you just learn to look for these things. :) However, the monitor is nice because we really have to be precise in our TTC efforts. It is comforting to have outside assurance.