I wouldn't worry if I were you. While in the womb, our los are exposed to noise at least as loud as a hair dryer, and provided it's not held up to close to their ears (which obviously you're not!!!
), it won't harm them. Keep drying your hair with your lo nearby! Dr. Harvey Karp of The Happiest Baby on the Block says that the noise in the womb is as loud as a vacuum cleaner, and he actually recommends using hairdryers to soothe babies.