Have moderate bacteria in urine test but rest is all (_ve) e.g the RBC, leukocyte, protein or nitrate. Need for urine culture & antibiotic? 6months preg.

Probably not. Typical care for pregnancy includes a urine culture in early pregnancy. If that was negative and you have no symptoms, I wouldnt' treat at this point. Your obgyn can be more specifically helpful at your next visit.