Eh I feel you lah! A few of us mum friends went through the same thing during pregnancy, jantung laju tu actually super normal sebab badan kita kerja double time, blood volume naik, hormones semua kacau-bilau Since you've already ruled out thyroid issues and the O+G referred you, it's good you're seeing the cardiologist just to be safe and get peace of mind, especially sebab makin dekat due date things can feel a bit overwhelming kan. First pregnancy is like a marathon of referrals, but honestly it's better to check everything out properly, paham lah the worry! Let me know how the appointment goes, I'm sure everything will be fine