Miscarried in past, WAITING 4 WEEKS FOR APPT :(

So I have had 2 miscarriages in the past little over a year, August 2016 and February 2017. We'll now I'm pregnant - I went in September 5th at 12 weeks and heartbeat was found I got ultrasound pictures and everything. Well I go back October 3rd, but this whole 3 weeks now, all I do is stress and worry thinking my baby has passed away and I won't know until October 3rd. I know it sounds ridiculous, but with past miscarriages (1 at 10 weeks the other 5 weeks), I just want everything to be okay :( Anybody had a similar experience or feeling? How did it turn out?