Ttc for 15 months, had my last period 13feb2018 on cycle day 93 i think, don't know why my period is…

Ttc for 15 months, had my last period 13feb2018 on cycle day 93 i think, don't know why my period is gone for so long, did pee and blood tests all negative, think i have hormonal imbalance... Drinking vitex for a week and prenatal, calsium and omega3 pills each day, any advice on how to get my period pls...