Stressed about waiting so long for a ultrasound

Am I the only one that worries really bad in there first trimester about the baby and is this cramp normal or this not normal etc. I found out I was pregnant at 4 weeks now they say I am at least 6 weeks if not more and going off by my estimated due date is am 8 weeks and 3 days today! But my first prenatal Visit is this coming up 26th and I am not sure when my ultrasound is. I am stressing so hard about my baby Cuz i feel like I waited to long to get in with the Dr this was his closest availability for me when I called. And I don't even know when he is gonna put me down for a ultrasound. I just pray this isn't too long. I know that some people get me later or really early. But I just want opinions no rudeness either please