Could this be possible?

Only 7 weeks but everyone swears I'm having a girl... All little boys are so nice and attached to me. s/O little nephew is autistic and is attached to me with only meeting me for the first time. Constant hugs and smiles. his mother says he's never like that with anyone not even her. Do people really believe in these tales of little boys liking you and little girls not liking you meaning it's a girl? Sounds crazy to me.