Aih, that heart palpitations feeling boleh jadi biasa in the third trimester sebab baby dah besar and puts pressure on everything, a few of my mum friends felt the same thing around 7 months, rasa macam jantung lompat-lompat je. But sebab you're feeling uncomfortable and the palpitations are happening even when you're resting, better benarkan check with your doctor cepat-cepat je, nak tengok blood pressure dan make sure everything okay with you and baby, it could be nothing serious, tapi better safe than sorry kan, especially at this stage of pregnancy.