Before 37 weeks is considered pre-term, and most doctor's won't stop labor somewhere between 34 and 36 weeks depending where you are from.
37 weeks. And it depends in the hospital as to when they'll stop labor. Mine won't stop labor past 34w. I just had my son at 36w and he spent a week in the nicu.
I believe your full term in your 40 weeks or between 38-40 I'm not sure. It depends how early you go into labor. When my mom was pregnant with me she went into labor when she was 7 months and they stopped it, then I was born 2 weeks after my due date