Anxious!! Baby #2

I am 7w 6d with baby # 2, but I am incredibly anxious about having a miscarriage this time around (we had one prior miscarriage at 6w before our first baby).  
First ultrasound and OB visit is scheduled in two days, but it just can't come quick enough!  
No spotting (except once after intercourse), but no morning sickness.  Ugh, I wish I could just quit dwelling on it, I feel completely irrational!
I have actually lost a couple pounds, due to eating healthier and stopping drinking.
Anyone else?  Any words of calming advice?