ada yg pernah minum air gula 2 kali ke?

Hi, saya dah check ada gdm masa minum air gula during 13week haritu. now 30week, and checkup di private. doctor saya kata dah tak perlu minum air gula lagi utk 2nd time sbb mmg dah tahu ada gdm. tapi kenapa ada certain mommies still kena minum air gula for 2nd time ya?