I just connected my bank account/credit card, but no data has pulled in. Did I do something wrong?

There's a couple possibilities here:

1. You didn't set the start date to a past date. If this is the case, you will need to delete the existing integration and set up the integration again with an earlier start date.
2. Your bank may not allow pulling of past data. If this is the case, you can upload data using the bulk expense uploader: Bulk Expense Uploader – My Reseller Genie