Masakit na puson (Diagnoes with UTI)

I was diagnosed with UTI last Monday at the same time placenta previa. Taking Cefuroxime alreadh as prescribed by my OB for 7 days. 2nd day taking meds, may sobrang sakit ng puson. Pwede ko ba sya pahidan ng ointment? If yes, ang reco? Anyone na naka-experience ng same? 15w3D pregnant