Is it a V-Fib, PVC or Something Else?

Since its happened 3 times I would contact your cardiologist and he/she may want to put on a holter monitor for 24 hours. Your medicine may have to be adjusted. If the beats were together and fast it could have be v-tach or they also could have been pvc's if they were not felt altogether. Anyway you should definitely contact your cardiologist.