Where did you buy the bitcoins?
Did you give them your bitcoin address when you bought them?
The Bitcoin (SegWit) network is currently congested and thus transactions can take much longer to confirm or might never confirm.
Check if the transaction to yout address has been confirmed using the block explorer.
BTC:
https://explorer.bitcoin.com/btc
If the transaction is not yet confirmed you can try a tx accelerator to get them confirmed quicker.