Not taking folic acid until actually pregnant?

Maria

I know it's good to start before you're TTC but I feel so bad when taking them: nauseated, irritable (to the point where co-worker pointed it out) and messed up sleep.

How bad so you guys think it would be to not take folic acid until actually pregnant?

*UPDATE* I went ahead and ordered a fully natural prenatal and hopefully it won't make me feel awful. Thank you guys so much for your help in making me realize I need to take prenatals or at least folic acid. I just felt so incredibly bad from them :P