I think your carseat definitely could work either way!
Oh, my husbands grandma looked at our ultrasound pic and said "Oh it's a boy! I can just tell." The pics were actually fuzzy...short stuff wouldn't really hold still long enough to get good ones! Besides I tried to tell her that it was still too early to tell but she insisted she just knew. (Btw, with my son, she was just positive he was a girl! lol) I'll have to post a pic later...