Upset!!! 😑

I'm 9 weeks and I'm at my gyno they told me 3 weeks ago that they would do an ultrasound for me and now they are telling me to wait till I'm 18weeks!!! What? I haven't seen the heart beat what if it's an etopic? What if my due date is off? This is my first pregnancy and I see on this app that everyone is getting ultrasounds before 18 weeks so why are they making me wait? I was so excited and now I'm so down 😞 wanted to vent ladies.