Glucose test

Hey mommies, so about a week ago, I took my glucose test..thinking everything would come back completely normal. Welp, my nurse called me and said that it came back abnormal (levels 141, when it should be below 130) and that the HEAD doctor wants me to come back in and complete a three hour glucose test and do a sonogram on my cervical lining. The three hour glucose ok, has anyone ever had to get a sonogram on your cervical lining? Exactly what does that mean? Could the baby be in any danger? #Help