Unfortunately the network is cluttered with a lot of unconfirmed transactions at the moment (81k from the time of writing this post) and as result, even transactions with normal fees tend to receive confirmations a bit late than usual.
Source: https://blockchain.info/unconfirmed-transactions
The only way for you to get rid of this issue for future transactions, is to use a fee higher than usual or better look at this website and use the appropriate fee: http://bitcoinfees.21.co/#fees
Posting your transaction link could also help in identifying the issue (which most likely is a lower fee than recommended).

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Most likely it will get confirmed (although will take a while).