Gaby Rodriguez would worry whenever anyone asked to touch her baby bump. It wasn’t because she felt shy or embarrassed. It was because the bulge — fashioned from wire mesh and cotton quilt batting — didn’t actually contain a baby. For the past 6 ½ months — the bulk of her senior year at Toppenish High School — the 17-year-old A-student faked her own pregnancy. Only a handful of people — her mother, boyfriend and principal among them — knew Gaby was pretending to be pregnant for her senior project, a culminating assignment required for graduation.