Did you just add a new credit card to your account? You may be seeing the verification charges, which are only "pending" until the verification is complete.
Thanks for the response - unfortunately no. They are charges that are coming from an unknown Upwork account. Trying to figure out who is the owner and if these charges are valid.
I'll go ahead and check your account and come back here when I have more information. Do you have any reference ID/transaction numbers in particular that I can use as reference?
ETA: Brittain, I just checked your account and do not see any transactions as there is no billing method added to your account. If you have more information to share (provided they do not have any private information), let me know so that I can look into this further.