Continuous lower back pain
and tightness in a 30 weeks twin pregnancy
seems to be labour pains which we say it as preterm labour. As it is twin pregnancy the chances of preterm labour are very high, however it needs more specific description of pain contractions. Added to this watery discharge for two days points towards premature rupture of membranes
which is also common in twin pregnancy and it needs to be evaluated for confirming the diagnosis as delay in diagnosis and treatment has deleterious effect on babies as well as labor.
If it is preterm labour pains and premature rupture of membranes then decision has to be taken on the basis of fetal maturity and amount of amniotic fluid
presnt. In any of the case supportive treatment is a must..