Uy, that's a great question! Yes, pwede ka pa ring mag-OGTT at 28 weeks, marami sa amin na na-test pa around that time or even later, so you're still within the window. But since it's about timing and your pregnancy, best to confirm with your OB directly para sure sila kung gusto pa nilang i-schedule, okay? They'll know best based sa full picture ng pregnancy mo.