Mine happened the last couple of weeks before I delivered as I had this sense that 'time was running out'. But I tell you--- I had something after I gave birth . . . I was wired. We got home from the hospital and although I was exhausted--- I couldn't sleep. I organized a closet, I remember, at 3 am. That's SO not me. I can't help but think that was some of that 'nesting' energy they talk about.
Its when u wanna clean and prepare everything for baby to come. It can happen any time and isnt an actual proven thing..
It can happen anytime..I've been "nesting" my whole pregnancy