ah I nkow how you feel, the worry is terrible, try and relax hun, it is easier said than done but I bet when you go in there you will be shocked to see a bouncy little beani!
I have my scan next Friday at 13 +2 weeks and even though I had a scan at 11 +5 I still get sooooo scared that something will be wrong, I am thinking positive enough for all of us and I hope that we are all going to be ok! good luck with the next couple of weeks they will go and before you know it you will be seeing your baby!