Yeah, my mom had one “the size of a grapefruit”, too. I wonder why a grapefruit is used for standard of reference. Why not, say, a softball? Nope, always a grapefruit… 
She ignored hers, by the way, and ended up with a bunch of ruptured cysts, requiring emergency surgery and a total hysterectomy when she was in her 30’s. I don’t suggest following her example.