I had a 3D picture done at the Fetal Medecine Unit at the hospy here in Canberra (not what you're asking I know) but since I'm 27 weeks, the sonographer said we might not get a good picture (we did tho). They usually don't do them until after 28 weeks (better even after 30 or 32 weeks) before before then bubs hasn't put on much fat and the pictures just come out looking scary! So - you've got plenty of time to research!