ZEC to Bittrex not confirmed after 48h

So 48h ago I sent 2 ZEC from my zcash4mac wallet to Bittrex and the transaction still pending… Why so long ??? Is the probleme from my wallet, Bittrex or the blockchain ??

amount -2.00000000
confirmations 0
details[0].account ""
details[0].address "t1MYLomSHBM786B2ZxRDin3RTg2fwLR3ZFS"
details[0].amount -2.00000000
details[0].category "send"
details[0].fee -0.00010000
details[0].vout 0
fee -0.00010000