So confused

So I'm roughly 6 weeks 4 days. Dr sent me for a dating ultra sound.... Dr couldn't see anything both abdominally or vaginally. She asked if I had used fertility drugs because it looked like I had based on my eggs ( which I haven't) I guess I have big eggs... She also told me it could just be too early to see the sac however I had a thick lining.. A little upset because I was so excited to see my sweet pea. My friend mentioned that there's a posobility that I am still really early and could be even earlier than I thought and that I may just have high hcg levels and joked I do have twins in my family. So now I wait a few weeks to try it all again.