Brown discharge before periods.

I had regular periods from starting and its still regular.But from past two months i have started planning for baby and i have seen suddenly i am getting dark brown/blackish discharge starting from 5 days before periods and after that discharge regular monthly period starts.Before i used to have 1 day brown discharge followed by period, i am taking folic acid tablet every night and figs and black raisin water empty stomach morning from last 2 months.I had chemical pregnancy in march, my feets are always cold and i check my temp every morning before getting up from bed and it varies from 93.5 to 97.Else everything is fine in my body no alarming issues or symptoms.I am worried seeing the symptoms do you feel is there any problem in conceiving?