exercise and ttc

Hi ! I have been ttc for the past nine months and it ends up BFN. I kindda lost hope... However for the past few months i realized that i have gained weight .. So i started exercising 4-5 times a week .. This month i decided to take it low in my fertile window .. And now that I am past it .. I just feel so tired throughout the day .. I dont know what's happing to me .. So does exercising decrease ur chance of ttc