Salam! Ya, I think that's palpitations, macam heart flutter je, very common especially kalau stressed or kena caffeine banyak sangat, or sometimes hormonal changes pun boleh trigger. A few of us mums in the group experience this bila pregnant or postpartum, tapi since yours tak sakit, it's still good to mention to your doctor just to rule out anything, especially if it happens frequently or dengan gejala lain macam dizzy ke shorness of breath. How often does it happen to you?