DD1 - 41+1 - felt no different til I was 7 days over. Had a show that afternoon, but that was it til waters broke at around midnight.
DD2 - 41 - pre labour for about 20 hours...great. Did have thick white CM for a few days before. Looked kinda like clag glue, (TMI)
DS - 39+5 - Nothing. At all. Contractions started at 5.15am, born at 10.15am. No CM, no show, no pre labour, nothing!

Every person, every baby & every labour is different. It will be over soon. Just relax & enjoy your last few hours/days.