You need to get it checked out. Could be something minor like caffeine induced palpitations, but it's always better to be safe than sorry. Get to the doctors get an ECG (which shows the conduction the heart) or an ultrasound
. You could also have a valve issue within the heart, either way, have an MD take a look at you. Then you can have a peace of mind or have the option of getting treatment if it's something to be concerned about.