more contractions

33 weeks today. My contractions have been getting more painful and my back is starting to hurt. Been tracking them and I'm averaging 3 an hour. My doctor said only call if I get to 4 an hour. I dunno I just don't see this baby staying in much longer. I went into preterm labor at 24 weeks so I'm very happy I got this far. My first was born at 29+4 so maybe this is all normal. I don't really know.