Preterm labor test?

J • Samuel 11/9/17 and Amelia 09/19/19 and baby number 3 due July 2021

Is it possible to still go into preterm labor a week or so after a negative preterm labor test? Like is that test for just at that moment or completely? I'm 33 weeks today and I'm already dilated to a 1, which wouldn't be anything major if it wasn't for the enormous amount of pain I have going on. I can't even walk anymore without wanting to cry. Everyone keeps telling me that I'm going to have her in the next few weeks and I am just wondering if anyone has went through this before?

Probably should add that my son was born naturally at 37 weeks.