OB says my “Waters are Bulging” but just 1.5 cm Dilated?

So my OB says my “waters are bulging”! I’m 39 weeks but just 1.5 cm dilated and 60% effaced. Wasn’t expecting for him to say that my water bag is super close to breaking.

He thinks my water breaking is imminent! Any moms have experience with this and how long did it take for waters to break or labor to begin?

And if my water breaks now, will labor be

tougher since I’m not that dilated and effaced?

Anyone experience this?