One hour Glucose test result is abnormal!!

Hi ladies,
Has anyone had an abnormal test result for one hour Glocose test and then passed the three hours one? I just got a call from my ob office and   They stated my test result is abnormal and I should go for three hours test. I'm 25 weeks and 137 lbs and overall I gained 7 lbs sofar.my height is 5'6" . I'm feel so worried.