Checking account bank question?

• best bank for checking
• financial accounting online
• motivated seller
• prepaid debit card with direct deposit

Alright so I opened my first checking a account today with my first paycheck and everything. I check my balance online and it says my deposit is being processed. Without thinking I bought an item on amazon from a 3rd party seller and I saw that the transaction is pending but my balance is at a negative since my deposit hasn't processed yet, I already sent a cancel order request to the seller is there something I should be worrying about? I don't want to be charged overdraft fees

Additional Details

Edit: I opened an account at Wells Fargo

What happens if the seller cancels?

Checking account bank question?