Guess it's a little late, but still a cute idea! Will keep in mind for future pregnancies. Make this yourself with a sharpie on a plain maternity shirt at start of pregnancy. Take monthly photos, while coloring in load bar along the way.
Sienna Miller's Striped Bump: Sienna Miller filmed a commercial for Amore Pacific skin care line on the streets of London while pregnant last Winter. Her striped shirt and ruffled sweater clearly emphasized her second-trimester bump.