Folic acid and B6 on my own ?

I have a 8 yr old son. We have never taken any precaution but still I am not been able to concirve for 2nd time.1st delvery was normal.My hsg is clear, tsh is also normal, folicle study is also normal. My husband's sperm count is 82 mil & motality is 30%. Kindly advice what to do as my gyne has adviced to go for iui straight away & my husband is not intrested in going for it. gyne has also adviced to take letroz 2.5 mg from day 3 for 5 days. I am little confused as what to do & more over its been such a long time now that I am despirate to have 2nd issue as soon as possible. Can I take Folic acid B6 on my own with the prescription? Regards, Hope to have an early advice.