Hi mama! Yes, 28 weeks is actually the perfect time, most OBs recommend getting your OGTT (glucose tolerance test) done between 24-28 weeks, so you're right on schedule! Best to confirm with your doctor kung exactly when sila gusto i-schedule mo, pero usually it's a quick process at their clinic or the lab nila. Just remember to fast before the test (usually 8-10 hours), and bring your prenatal records para sa checkup.