inability to conceive can be due to various conditions like anovulation
due to contraceptive
pills or due to excess stress
, or due to any anotomical problem in the reproductive organs of both couples.
i would advise you to get a complete health check done for both you and your partner to rule out any anamolies.
also you need to stop taking any contraceptives if you are on any.
continue on folic acid
and try to conceive on your most fertile period that is your 12to 16 day day of your cycle if you have your cycle for 28 days.
i hope i have answered your query.