Hello,
After you ovulate a woman is able to conceive for about twenty-four hours. A sperm can live for three to five days. You can try having sex regularly five to six days prior to the expected date of ovulation and continue daily until the day after you ovulate. You should start taking folic acid, exercise daily and reach your optimal weight. Take a healthy diet. If you have been unable to conceive for one year then you should consult a gynecologist for an evaluation. The reason of not getting pregnant may be because of medical problem either in you or your partner. You and your partner both need to be investigated. Some tests may be necessary like semen analysis in men and to check for ovulation in women. For more queries and assistance visit a gynecologist. Hope it helps.
Best luck and regards!