Dilating so early!

Stephanie • Mommy to two boys and one girl
Alright ladies I'm dilating pretty early and wondering if anyone else has something like this?
33w-closed and high
34w- 1&1/2cm and high. Very thick. 
35w- 1&1/2cm high and very thick.
36w- 3cm, 60% and baby head is engaged
This is my 3rd baby. With my first 2 I didn't start to dilate until I was 38 weeks. Anyone else go into labor quickly after? 
P.s- at my 36 week ultrasound baby is 6lb 2oz