Ohhh ye normal jugak, aku pun rasa macam tu kat third trimester dulu, tetiba je rasa panas kat atas perut even tak kena dengan meal. A few of us tried ginger tea or minum air sejuk, sometimes it helps jugak, tapi honestly yang paling relieve tu bila dah dapat posisi tidur yang comfortable atau after a good walk. Tapi since ni boleh jadi heartburn, indigestion, atau even something else la, I'd suggest check in dengan doctor or midwife mu just to be safe okeh, better to confirm especially kalo happening frequently macam ni.