Dont worry, it will get through soon, the whole blockchain is saturated right now. Just look at this:
https://blockchain.info/unconfirmed-transactionsMore than 2120 transactions without a first confirmation, the last time that we saw this kind of numbers on the unconfirmed transactions was on November 12nd (the day in when bitcoin was under attack of bch)
But this is preocupant for all the ecosystem, dont worry about it, coinbase is going to confirm it, or at least to send it to the network soon.
I havent been using coinbase for the same problem, i dont want to risk my funds because of that.