TTC#2

Af was supossed to come today insted brown discharge is happeng somtimes the discharge is long string type but no bleeding what cud it be my af or IB and my cycle length is 31...trying to concieve since 7 months😔...this cycle was on letrozole and ovabless (frst round)...am loosing hopes now plz if anyone have experienced such things share here !!! i want to get pregnant and my husbnd wil be leavn ds month last what shud i do? Anyone help