Are you supposed to take a multivitamin with folic acid or folic acid plus a multivitamin when trying to conceive?

No. You are not supposed to take them when trying to conceive. But every body should take multivitamin preparation like Becadexamin daily. Unless to take lot of green leafy vegetables or fresh fruits in your diet. Multivitamin preparations with high dose of multivitamins are not recommended for daily use. Your kidney has to excrete the extra dose.