contractions!!

Krystal
I am 37 weeks and have gestational diabetes. Today during my NST they said I was having contractions. I've been thinking it was just pain from my sons head in my pelvis. 
I've had a few rather intense contractions the day before and a few today none of them consistent. 
She said not to be alarmed and it doesn't mean I'm going to go into labor. 
I know no one has a crystal ball for when you'll go into labor but has anyone else started out like this and how long did it take you to go into labor?