Birth control/lump

Hi! So I'm on the combination pill and i have been for about 2 months. Ive been pretty heavily bleeding for about a week now. the blood kind of comes in waves where i'm not bleeding at all and then it's so much that i'm bleeding through my underwear and my jeans. ok so in addition i was fingering myself (TMI i'm sorry) and i felt a large lump on the right side of my body (left to me) inside my vagina. it's pretty far up and i felt it pretty instantly and i was just wondering if anyone has any idea what this could be or if it's related to the bleeding?