I was terrified , I got my glucose test at 27 weeks, they gave me a Orange drink. it tasted like pure sugar. I puked twice. an older lady took my blood, she did both arms. my left arm she missed my vein and dug in my arm I passed out, she was nearly about to collapse my vein. I don't understand how they had so much trouble taking blood when I go to my baby doctor and they take it in less than a minute. this lady took like 5 minutes tops. it sucks, but hopefully you won't have the same experience as I did. but come to find out I don't have gestational diabetes . :) just think positive.