That's right, the mempool now are very congested that cause many pending transactions, most commonly on this case, it takes 7 days before it will reject by the network your transaction. See here the graphics shown by mempool status right.

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What wallet you have been used on this transaction? If you use Electrum wallet you can replace the fees as suggested above and follow this (How to Fix Slow Bitcoin Transactions with Replace-By-Fee), you can also try to accelerate this transaction via ViaBTC the most recommended Bitcoin transaction accelerator tool.