High risk... Being treated like a normal pregnancy 😕

So I had 3 miscarriages and now I'm 17 weeks pregnant!😝 this is the furthest I have ever gone(7weeks was my longest) I was given an ultrasound at 8 weeks nd since then my 12 week and my 16 week appointment we just heard the heart beat... I won't get my next ultrasound until 20 weeks 😕 I should be happy right? I mean I guess that means I'm having a great pregnancy... Talk to me ladies...