As you can see here there is a congestion in the network
https://blockchain.info/unconfirmed-transactions maybe someone is spamming the network, which is why even the transactions with the normal fees are taking too long to confirm, but it will ultimately subside and when it does, your transaction should go through.
There is a huge amount of congestion with the transactions. I bet that it is just a bunch of people spamming it. It should be gone by tomorrow.