Sayang, I understand you're worried, dating discrepancies happen more often than you think, especially kalau cycle tak regular ke or ovulation lambat. But honestly, this needs your doctor's eyes asap, okay? Jangan delay, go back and talk to your gynae about the size difference and the heartbeat, sebab they need to do proper assessment and maybe another scan soon. A few of my mum friends went through similar dating mix-ups and turned out fine, but some did need closer monitoring, either way, your doctor will know best what to do next. Stay strong, mama.