It COULD be a sign that baby is coming or it couldn't. I just lost mine 2 days ago (27 weeks). Doctor did a fibronect test to check for signs of labor within the next two weeks. I am on bed rest until the results come back (this morning).
It doesn't mean baby is coming. I lost mine 3 times in my first pregnancy and it just grows all over again. This pregnancy, I already lost it at 25 weeks.
A sign that the baby coming soon