Yellow discharge, 31weeks pregnant

Is it normal to have yellow discharge that is watery ? I'm 31weeks pregnant. Mahirap laban yung mga undies ko dahil sa yellow discharge na lumalabas sakin. Nagalala din ako dahil medyo madaming yellow discharge na parang tubig lumalabas sakin, nagpapalit at nagwawash naman ako palagi. Normal lang ba yun or dapat white & clear ang discharge pag buntis? Pls answer mga mumsh. Thanks!#firstbaby #1stimemom #advicepls #pleasehelp