Upvote:1
Is that something I should worry about ?
Generally no. It can take a few days for the transaction to fully complete. If it's less than three days, I wouldn't worry. If it's more, you should follow up
You typically get two e-mails from United. The first one comes immediately after booking and typically says "your reservation is processing". The second one says "eTicket Itinerary and Receipt for Confirmation XXXXXX" and often comes just a few minutes later. Once you have the second one you have a confirmed reservation which is all you need for travel.
If your charge is still pending 72 hours after booking I would check the booking on the United website and make sure it's still ok. I doesn't harm to call them up and ask.
Confirmation number: J2LXXX Ticket status: ticketed Aug 15, 2021 at 4:48 PM Central Time
If you have a confirmation number (6 digits) and of the ticket stats says "ticketed", you are good to go.