Ok, so what's the best way to pin point, or come close to pin pointing ovulation? DH and I are TTC again, although I think I missed the chance this month, I want to figure out about when I'm O'ing. I don't get any pain when I do. My cycles are between 31-38 days so far, I've been tracking for four months. You can see it on my profile I have an ovulation tracker, which I'm currently using to track AF. I have a nine day gap so far in end date for AF, and all the online calculators for ovulation show a five day fertile day window, so for example this month, if AF was my lowest cycle of 31 days my fertile window is Sept 20-25, and if it's the longest at 38 days it's Sept 27-Oct 2. So there's a total of 12 days that could possibly be my O day, going by the online calculator. BUT the weird thing, that I don't get it...I always have irregular periods, since I first started at 12 years of age. When I got pregnant with my son, LMP was Oct 3, 2007, based on u/s I got pregnant on/around Oct 17...that's CD 14 give or take a few, which would put me on a 28 day cycle. How is that possible? I know you can ovulate early, but I've always had at least a 30 day cycle. I don't want to spend a lot of money on OPKs, I used them three months in a row Apr-Jun, and never got a positive. I don't know if I was using them the at the right time or not. I'm clueless as to when I ovulate. I know ovulation happens 14 days before AF, but without having a regular cycle, I have no clue when to count back to.