Oo, maraming kaibigan ko ang gumagamit ng calendar method, lalo na pag ayaw ng hormonal contraception or planning for baby! Pero honestly, it works best if regular talaga ang cycle mo, sa akin kasi medyo off, kaya combination lang namin with condoms to be safe. The thing is, kailangan mo talaga ng discipline to track properly, at dapat both partners ay on board, otherwise stress lang yan haha. A few of us try it during the "safe" days, pero realistic lang, mas nakakatulog kami ng mahimbing pag may backup protection naman. Goodluck sa honeymoon though, enjoy lang!