yes go check it out, but just wanted to share: have had my fair share of knocked toenails and some have gone black & come off completely. never really worried about it being connected to being T1D...until recently, where every possible ailment i'm thinking is a 'complication'. one of my toenails kept going 'loose' and i'd keep having to remove the nail, recently i automatically thought 'well that's it, the big D has started to claim my extremities'. after about 8 months of this, i only realised the other day that the nail has completely recovered and is exactly the same as all the other nails, sturdy as you like.
hope your toenail falls off nicely and a lovely new one is growing underneath!