Gestational appointment

Hello everyone, Yesterday I had a glucose test and today I received a letter from hospital where they say "a telephone appointment has been made for you under the care of the Diabetes Team" – first of all it makes me worry. I don't understand why to email a letter without actually saying what it is? Anyway, does anyone know if means that I would need to re-do the test? Or it could be just something like a warning call that I could be in the risk or something? Has anyone received such email letter appointments? It's just I don't know what to expect and the appointment is like after 10 days which is far away