Randomised patients would be assigned to receive indomethacin either placebo oral use(50 mg every 6 hours during 5 days) to evaluate the efficacy of indomethacin as complementary treatment to increase the gestational age at delivery in women admitted with preterm labor and intact membranes with high risk of intraamniotic inflammation, defined as a gestational age at admission less than 28.0 weeks or those women from 28-32.0 weeks with a sonographic cervical length less than 15 mm