I had catheter ablation for svt and atrial flutter yesterday. should i feel a different heartbeat if i'm cured?

Not necessarily: Some individuals do not have symptoms or feel their rhythm disturbance. Others that do have palpitations or other symptoms often feel immediately better.

Yes: If you were constantly in an abnormal rhythm and the ablation was successful, you should feel different. However, if the rhythm was intermittent it may be more difficult to discern a difference.