preterm labor and procardia??

Anyone had preterm labor and been placed on procardia? I'm supposed to stop taking it this Wednesday at 35weeks. I'm curious if I will go into labor fairly quickly after I stop? I have read some things where some carried til 40+ after taking it. I'm 4cm dialated, 50% thinned already and never completely stopped contractions, they just lessened and haven't been very strong.