Autism in multiple children

My oldest is on the spectrum, he is very high functioning he just has some behavioral issues and speech delayed. I’m currently pregnant with a girl , and I’m terrified to tell even my husband but I’m scared that this one will be autistic too, not that there is anything wrong with my son but it’s been hard with him and I’m so scared to do it again with my daughter. Is there any proof that having one means your other will be the same? I also seen the likelyhood of girls having autism is a lot lower than boys. Anyone have multiple ? Or have just one ? I really don’t have ANYONE to talk to this and I feel horrible for even admitting that Its a fear of mine