Unless you have the fluttering while the short EKG is being performed, I would bet they will see a normal sinus rhythm. If you have them during, they can tell you what they are. Keep in mind that PVCs, and PACs can feel different at different times, even when they are the same thing. It is strange, isn't it? If you feel you want further evaluation, a holter monitor is your next step for electrophysiology. If the doctor wants to check if your function is abnormal, an echo will tell you, and if you want to know what happens to your heart during physical activity, then the stress test is your answer. Costs are very different for everyone so that is not something that can be readily addressed.
If you are like most of us, and I suspect you are, you are experiencing a very common occurrence, however, uncomfortable.