Before sending out a transaction, you have to keep an eye on the optimal bitcoin network fee rate and the size of unconfirmed transactions in the mempool so that you are not in for surprises.
This thread has tools that can help you observe the mempool - List of Bitcoin Mempool Viewers for Reference
If you have worries about whether your transaction has been confirmed or not, Bitcoin block explorers can be helpful in viewing the state of your transaction
This thread has tools that can help you observe the state of your transaction - List of useful Bitcoin block explorers