I got mine done
at 19 weeks. The photographer was awesome, she posed me to emphasize my belly :) i went to portrait innovations . It cost me 375$ for 30 different frames, a canvas, 4 hardcover books of the pictures, a Calendar that was baby themed, and specialized shots that she layered like a collage. I also got 6 sets of 5x8 of each pic to send to family and a free disk of all 176 pics i took in total.
The more frames you want the more it cost, the less frames the less you spend.