Sayang, jantung berdebar during pregnancy boleh jadi normal sebab hormones dan blood volume changes, tapi since you're unsure, please call your doctor or clinic today to check , tak perlu tunggu, terutama kalau ia berulang. Better safe than sorry, especially first pregnancy kan. A few of my mum friends experienced this too, tapi dorang all got checked just to rule out anything. Takut-takut jer, okeh?