When should I get my 3D 4D HD Ultrasound scan?

What week is the best to get an ultrasound scan? Well it all depends on what you want to see. The first trimester is full of mysteries,The second trimester we can feel the little creature in there but, still a mystery, and 3rd trimester we can imagine them looking like nice round chubby babies. here is a week by week image gallery to help you better decide.