Freaking Out (sort of)

I just got home from work feeling good and I hear a phone message from a nurse at the doctor's office asking me to call the nurse's line & ask for her & that they have information for me. What??? You can't leave a message on a pregnant woman's answering machine w/o giving more details just in case they don't reach it until after hours as I have & now don't know what to think? Do I have gestational diabetes? He told me we would talk about the results at my next appointment, so is that it? Did they find something in my urine? I was already kind of freaking out today b/c I was having some weird cramps which I think it was just that I needed to poop and I did later on today, but the baby wasn't moving around as much this morning. She has been back to normal ever since so I don't think anything is wrong, but I am definitely worried. What do they want? Does anyone know why they would need to talk to me???