I am now at 30 week too. Last week I started to have contraction 2-3 times every hour with some discomfort like when my period comes. So I consulted my C+ Dr. She immediately gave oral medication to me (3times daily) She insists that if it does not help I would need to be in the hospital.
After taking the pills, I only get 5-6 times daily. I think you should consult your Dr. immediately when the contraction is becoming frequent EVEN THOUGH you have no PAIN. Because you don't want to get into PRE-term LABOUR.