I really feel you on this, the postpartum period is already so overwhelming and then having heart palpitations on top of that must be so scary. It is actually something quite a few mums go through after delivery, and I am glad you already went for a check up and got the all clear. That said, if the palpitations keep happening or feel more intense, it might be good to go back to your doctor again just to be safe, since your body is still going through so many changes after birth. You are not alone in this, take it one day at a time and do rest as much as you can.