I personally had sex every day about three days before and after my estimated ovulation, and once during. I'm not sure exactly which day I conceived, but I do know that it happened that same month. They say the odds for a healthy couple conceiving are about 20-25%, and we fell into that margin the same month we began trying.
Some people suggest you try every other day, to maintain a larger sperm count in your partner. I would suggest you start a few days before you ovulate, just to get some of the little guys into position, but do it as often as you like. Remember to have fun, and try not to think of it as a job. Sometimes you can get so wrapped up in conceiving a baby that you forget that sex is supposed to be enjoyable. Good luck, hon! *baby dust*