10.5 weeks, feeling worried.

I know every pregnancy is different. This is my third pregnancy, first with twins. And I have not a single symptom. I'm not even showing at all, not even the slightest bump and now I'm starting to worry about vanishing twin. Had an ultrasound at 8.5 weeks and both had strong heart beats. Is anyone experiencing the same thing? All I've read is how sick everyone is, and seen the pictures of there cute baby bumps and here I am. I feel great no more fatigue, just hungry still and frequent (annoying) urination. I've flooded my head with so much reading material and I don't have a doctors appointment until the 9th.  Am I just worrying to much?!