Pregnancy

Hello -- I'm 19 weeks pregnant with twins --- 6 days before i have tooo much lower abdominal pain -- dr told me it was preterm labour pain --- i was admitted in the hospital & they managed to stop pain (with belwo injection)- Now i am at home & they have given me discharge after 4 days & now i am feeling ok but after urine sometime i have little pain- They have done cervical stiches on 1st June - and my placenta at low lying . 1. Atosbian dose 2.Dyanapar 3.Monocef ( antibiotic) After these dose how long does preterm labour pain will be delayed ??