33 weeks- labor or Braxton?

Okay so- I've had pretty mild Braxton hicks throughout my pregnancy (this is my first) and today, after getting off the eliptical I noticed that they were a little more intense, kinda on and off all day, I didn't time them or anything just chalked it up to practice labor/ walking doesn't change them either, then tonight, my hubby and I had sex (pretty rough) and now they seem worse than they've ever been/ dos the sex cause Braxton's to be more intense or am I in labor?! I'm kinda freaked out, I have lost my mucus plug or had and leakage or anything, just the cramping :( someone please help me out, they're pretty bad...