Coughing My Prim started coughing this morning?

This morning as I sat watching my piggies enjoy their veggies, I noticed that Prim had started coughing. At first I thought she was just choking a bit on her food as she was eating pretty quickly. But then she started to cough even when she wasn't eating. Everything else is normal. She's eating and drinking, peeing and pooping. She's even running around and playing with her cage-mates. Just wondering if I should be worried? Should I call the vet and see if this is something that she should be brought in for? She doesn't seem to be coughing all the time. Just once and a while. But I don't know for certain as I'm not always in the same room with her all the time. What are your thoughts? Perhaps I should put her into quarantine until we know why she's coughing?