I have always been irregular and didn't understand ovulation predictor kits either, especially since it seemed I'd have to take them for 2, 3 or even 4 months straight before I'd ovulate. Then again, despite the predictions of every obgyn I've seen, I've gotten pregnant pretty easily. DD1 was a surprise while using pretty unreliable birth control. DD2 was conceived after about 3 months of sex 3ish times a week. DS was conceived similarly, but I think it took 4 or maybe 5 months.
For DS, we had a shrinking window to get pregnant. I had read in "Women's Bodies, Women's Wisdom" that daylight directly striking the retina (no contacts or eyeglasses) helped spur ovulation, and I figured it certainly couldn't hurt. So for 1-2 months until I got pregnant, I started walking outside with bare eyes for 15ish minutes every morning. If DH had to leave and the kids were asleep, I took a baby monitor and walked laps around and around my short cul de sac. I figured if it helped me lose any weight, that in and of itself might help with ovulation.
But what I wish I'd done was think things through a little. In retrospect, I was due for a period since I hadn't had one in pushing 3 months. I could have stepped up the TTCing just on the assumption that I was due to ovulate after that amount of time, and that probably would have worked.
Also, DH stopped biking around that time, which may have improved his sperm count. I dont think he changed his laptop use, but I am suspicious that men holding warm laptops in their laps decreases sperm counts, so think if that might be an issue in your relationship. Maybe use a lapdesk or put the laptop on a table.
Advice and commentary on living overseas
DD1 15, DD2 12, and DS 9