NIPT Gender Wrong?

Has anyone ever heard of the gender results through NIPT being wrong? I was told boy today (fetal fraction 8%, got tested at 10+2) but really felt like I was having a girl & my pregnancy has been so different! I have a boy now that is 15 months. Is it possible his Y is still somehow in my body? Or a vanishing twin that was a boy? Am I reaching here? Lol