What they mean is your belly will feel different. Depending on what sort of breech position bub is in now he might move up higher. Once he is head down you will feel a diff sort of pressure down below. When bub finally engages you will feel it in your chest too, breathing will become somewhat easier. Your belly will feel diff from the outside too.

Although in saying all of this, my SIL had no idea when her baby had turned around at 36 weeks.

Sending you a stack of head down bum up vibes hun.

I think I will wait another couple of weeks before I start to encourage this baby downwards. As my muscles are so stretched the likelyhood of her turning back is higher too.