i haven't had much success with breastfeeding my new born. so i am sticking with formula. i have…

i haven't had much success with breastfeeding my new born. so i am sticking with formula. i have been pumping but i can feel my milk supply drying up :( i was feeling my right breast earlier and i felt a lump, kinda big, doesn't hurt. idk if it's a clogged milk duct or something else. any one felt something similar? kinda worried it could be something else but my check up appointment is not for another two weeks. thanks.