Since this month was our first chance of getting pregnant since the miscarriage and my last two cycles have been off, we didn't even attempt to figure out my ovulation days this past month. I guess you can say it was a Russian roulette of sorts.
I was thinking of buying a Clearblue Easy Fertility Monitor
I looked at the calendar, found a wide range of possible fertile days (based on a 21 day cycle, a 24 day cycle, and a 28 day cycle), and informed my husband that we'd be having tons of sex between September 22 and October 1st. He was totally on board. :)
If it doesn't happen this time, I'm buying the monitor.