Hi! Biasanya detak jantung baby boleh dengar around 5-7 minggu dah, but it depends la on the machine and how clear the view is. Aku punya friend pergi USG at 5 weeks and the doctor said dah ada detak but very faint, so a few of us tunggu sampai 9-10 weeks baru jelas sangat. Kalau sampai 12-13 weeks tak dengar lagi, better to double-check with your doctor to make sure everything okay, tapi jangan worry too much, sometimes it's just the angle of the baby or the equipment. By 12 weeks onwards, detak jantung should be clear around 120-160 beats per minute. Hang in there, Mama!