Definitely start taking it now.
I have read that it's considered best if ALL women of child-bearing age (whether thinking of ttc or not) were to be taking the higher dose of 400micrograms per day, just in case they get pregnant. It is SO important in such an early stage of foetal development that you really wouldn't want to miss out on it being there, ready.
You can get folic acid quite inexpensively from online shops, so it's definitely worth getting yourself a long-term supply.
Also, men benefit from taking folic acid, too, as it's needed for making dna. Some studies suggest taking it to avoid chromosomal abnormalities.
If you really want to avoid taking pills, eat more leafy veg like spinach, orange juice has it, avocadoes, asparagus, any citrus fruit, although folic acid is easily damaged by cooking, hence the advice to take supplements. About 80% of people don't get nearly enough folic acid from the normal diet.