12 mg beta methasone injection is is indicated in all pregnancies at risk of preterm labour between 28 and 35 weeks to attain LUNG MATURITY. Since there is no indication of fetal distress it is not given. Tocolytics are used to inhibit contractions and keep the uterus quiescent in case of preterm labour.But it is not indicated after 34 weeks. Cervical cerclage is useful in some women with HISTORY OF preterm labour. Thus vaginal swab culture is can be used in this condition as presence of bacterial vaginosis has been found to be associated with preterm labour and most cases are asymptomatic. (TB of OBG sheila 2 and edition pg 193,194,573)