Morning Sickness or Early Labor?

Montano • Mommy of 2 expecting a third by Halloween or early November. I got pregnant with my first at 17 had him in 2016 , had my daughter in 2017 having the next between Halloween and November of 2018
So I'll be 35 weeks tomorrow . The past couple of days I've been real nauseated, last night I was having really bad lower back pain along with BH . This morning I woke up nauseated and actually did vomit. Is this possible morning sickness has come back or is it possible that labor is near ? Still having back pain and BH.