Blood test on parents insurance plan

I have a blood test Tuesday..I'm 5 days late now. I am still on my mom's medical insurance (my husband is in process of us going on his)...I do not want my Mom to get ANY explanation of benefits or lab results....did any of you go through this? Can all paperwirk for my visit get mailed to my house instead of hers? I want to surprise her when I'm in the safe zone of pregnancy (if I even am)..not have her find out in the mail..which I think they can't even do..but I want to be sure...