Best way to avoid pregnancy without using contraception?

I've been on the pill for 12 years without any problems but as my husband and I are thinking of starting to treyig in approx 12 months time is like to get my periods nice and regular  before that happens, so I've come off the pill. What's the best way to avoid getting pregnant apart from using condoms? Are there any points in the cycle to avoid? Do we have to use condoms every time?