Hot baths dont increase or decrease REAL labor contractions. Go when the time doesnt vary so much. For FTMs they say dont come in til they are 4-5min apart for an hr without slowing down.
If your having pains five mins apart call our go into l&d. I only felt contains for an hour before my first was born.
If your contractions are 5min apart and are really painful I would head to the doctor to be checked