Lump in my uterus

Hi gals.

so i was going in for my monthly check at home. i discovered a lump in my vagina like 3-4 inches inside. i had my period last month on oct 15. i did have sex on the 22. it was unprocted yet he disnt come inside me at all excepet pre-ejculate. ok so the lump is hard, its like a pointing finger: cylinder and attached to my walls. it doesnt hurt.i have no pregnancy symptoms whatsoever. all i feel is panic cuz im not sure if im pregnant or it could be something like a cyst.