Hi!
Those kits ARE pricey! The way to use the kits--and I would invest in a few if I were you--is to find out when YOU usually ovulate. Most women ovulate between 11 to 16 days after the first day of their menstrual period. If you use the predictors and get a positive result on day 12, record that, and save the remaining 4 test strips for next month. No need to do any more once you ovulate. If you DON'T ovulate within that interval of time, it may be that you have a problem with ovulation and need to see a doctor for some medications to stimulate your ovaries. If you DO ovulate consistently, and are still not getting pregnant, then its time for him to get a semen analysis and you to get an HSG (hysterosalpingogram) to check to see if your tubes are blocked.
Hope this helps!
Good luck!
Dr B