Have you been getting enough fluids??? My doctor regularly reminds me that if I start to feel contractions to first make sure I'm hydrated. Drink plenty of water and wait a little while. Being dehydrated can cause contractions to begin.
Agree with above- call your doctor.
Even at 37 weeks they have to use a respirator with some babies. Yes, call your doctor.
35 weeks is too soon. I would call your Dr. They baby's lungs are not full developed until 37 weeks.