When does your water break?

I'm 35 weeks pregnant. My son was born at 36 weeks. I'm having regular contractions 5 minutes or less apart. Since I'm so early my doctor told me not to come in unless my water breaks. WHEN DOES IT NORMALLY BREAK AFTER CONTRACTIONS GET SO BAD?! My son was breach so they took him incase water breaking would hurt him. I've tried water, baths, and laying down and I just hurt. Is the light at the end of the tunnel soon??