Every other day is fine as long as your partner's swimmers are good. And every day during ovualtion is good, too again as long as your partner's swimmers are good.
BUT it really matters to have sex around the time you ovulate. But if you do not want to take the time to figure that out, then having sex every other day is what I have heard that people will do.
Totally agree with Tarobinc. Having sex on alternate days is good usually. and during ovulation days; everyday is good; hope you are tracking your ovulation. and take some folic. some of my friends who were on pill took about an year to get pregnant.