Diabetes screening.

Heather Evelyn • // Baby girl was born 08.27.2015 // Married my Husband 11.11.2014 // I was born 01.02.1996 // Christian //
So, I done the first diabetic screening and passed it perfectly. Now at 24-28 weeks my OB is wanting to do another. I really don't want to take the test considering I check my blood sugar often (I have low blood sugars most times). Also, I barely made it through the last texting without throwing up during it. I was so sick afterwards. How should I go about telling my doctor I don't want to do the test (even though they say it's required)?