Worrying is pretty normal, but lack of sleep doesn't sound too good!!
I had major anxiety towards the end of my pg, and it was probably a form of antenatal depression.
Hopefully your 12 week checkup will clear it all up, but if you are still having problems sleeping, I'd have a chat to your midwife/dr about it. They may refer you to a counsellor just for a chat. Thats what I did and it helped heaps Now I'm almost normal........ 8-[