No signs of pregnancy

I'm currently 5 weeks pregnant and I have no symptoms or indication I'm pregnant. I found out I was pregnant last week via a home pregnancy kit. I immediately booked an appointment with a gynac and they told me to come back after three weeks as it's too early for it to show in the scan. I'm worried if I'm even pregnant because I don't have any early pregnancy symptoms, nausea or fatigue. My appetite is unchanged and I have alot of energy. I'm starting to worry it might have been a false positive. Any advice?