I have my ultrasound in 15 hours from now. I am soooo nervous..

and excited. I kind of feel like I shouldn't be excited but I am..
Just to recap.. I had my BFP on 9th Jan, accompanied by spotting, HCG on 12th was only 35. Heavy bleeding started on 13th, lasted for 2-3 days.. during that time I had an ultrasound (4w3d) which showed a tiny bit of tissue(??)
I went back for a blood test on 25th Jan as I was still testing VERY positive (they were getting darker) HCG over 4000. Scan booked for tomorrow.
I'm sooooooo nervous. Don't know WHAT to expect, although I am feeling surprisingly positive, and I do feel pregnant, but it could just be down to the hormones. Ugh.
Please keep me in your thoughts and prayers