See if you can get prenatal acupuncture or chiropractor.
If you can see a naturopathy store, they can make you a tincture to assist with the uterus starting contractions. I swear this is what kick-started mine in 1.5 days. I was over 40 weeks and had no signs otherwise. 8.5h natural birth.
Drink raspberry tea i drank Lipton tea raspberry and went into labor instantly i went days before to the ER and my cervix was thick and wasn’t dialated i drunk that tea and started getting contractions
I had no labor pains until 40+3. I started having contractions and reached hospital 3-4 cm dilated. Did not have any cervical check or membrane sweep too prior that. So you can definitely go into spontaneous labor without prior symptoms. Hang in there.
I had this. I went in for induction to break my water and hormone drip. Xx