I lost count the number of scans I had with my last two bubs (28 and 25 weekers)....especially my last bub.
With #7 I also had the normal 6w, 12w and 19w scans...also 16 weeks, 21weeks and 23 weeks (external and internal scans)...I also had about 4-5 small scans when I was admitted...only my 12 week scan cost anything the rest where in the public hospital so where free.
I had to push for some of my scans because I was so scared of having another prem...fortunately because of that they picked up my short, funneling cervix and I got another week in.
You will probably be classed as high risk which usually means you will have more scans anyway....once you have had troublesome pregnancy they do like to keep a closer eye on you.