best time na magpa- RBS?

Hello mga mommies and mommies to be, anong best time magpa random blood sugar test? And ok lang ba magpatest khit kakasaksak lang ng tetanous toxide sakin today (05-13-2020) one last question, may pa hepa b test ok lang ba kumain pag napagtest non kase isasabay ko sa pagtest ng RBS. Salamat. Sorry daming tanong FTM po.