Eh don't worry lah, 3.4kg at 38 weeks is actually normal and healthy, many babies are born around that weight and deliver just fine! A few of my mum friends also had similar weight babies and everything went smoothly, so the weight itself shouldn't be the blocker for a natural delivery. Best to chat with your doctor or midwife about your specific situation, they can assess your body and baby's position to give you a proper picture on what to expect during labour. Take a deep breath, you've got this!