Considering a Confidential Communications Request for STI Test

Im so nervous about my parents seeing im getting an sti test im considering submitting a confidential communications request but I think it can only be done by mail and it probably won’t get there in time anyway. It also says theyll honor the request if failure to do so would endanger me and that’s not necessarily true so I feel like I shouldn’t but i just don’t want sensitive services to show up on the bill. It would probably be extra suspicious if she suddenly stopped receiving any of my health information though and that’s the only option I have.