I am 30 weeks pregnant and I had mine with this consultant when I was 25 weeks pregnant.
The price was 250 for 3D and 300 for 4D.
Have a look his website.

www.dr-fawad.net.qa

I wish you luck because my baby was a bit shy and I could not see his face properly.

GOOD GIRL is right. You should wait some weeks more or you will be disappointed.