1) Basal body temperature tracking - find out when she ovulates and begin tracking cycles to figure out optimum time to "try" (5 day window before ovulation day). It took me a few months to figure it out - once I did, it happened the very next month.
2) Google "Preseed" and use it
3) For men, the maca supplement can aid in fertility
4) Don't wear tighty whities and stay outta the hot tub. Keep the boys cool.