Sometimes during high load on the Bitcoin network, and especially with obsolete wallets that don't use proper fee estimations, transactions don't confirm quickly. Your money is completely safe during this time as they actually remain in your wallet until the 1st confirmation is received- if your transaction ends up not being confirmed, the bitcoins will appear in your wallet again.
In order to avoid these problems, we recommend:
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Use updated wallets that support Segwit addresses and are good at fee estimation.
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Use the Lightning Network, a payment protocol for bitcoin that allows instant transactions with unfairly cheap transaction fees. Here is a good resource to learn more about Lightning wallets.
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Learn about how to easily start using Lightning Network.
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Use a Bitrefill account, where you can prepay a balance and do multiple purchases instantly and without fee, learn about Bitrefill Accounts
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Read this guide about how to save money on Bitcoin Network fees and deal with confirmation delays.
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You may also learn about how Bitcoin fees work.
- You can learn more about how Bitcoin transaction work here: How do Bitcoin transaction fees work?