Hi! Okay, started DEX last week. First insertion with instructor a bit traumatic for my daughter but everything else went well for the week. Tonight, took out old site, readied stomach for new site. Daughter was scared but said she could handle doing it on our own. Got site in position, pushed plunger down, and pulled inserter out. Was wondering why we had ??? for so long. Finally receiver said failed sensor. Pulled site off and no little metal thingie. Read book and discovered I forgot to pull up on collar to pull needle out and leave sensor in....major OOOOPS. My question is, did I totally screw up and the little metal sensor is still under her skin? Or by not pulling up on collar it never went into her skin. A bit freaked out and hoping I didn't mess up real bad. Thanks for any help with this. My daughter is great though; even after that screw up she let me try another and it worked..I think..lol...this time. Will see in a few hours if it asks for BG readings.