Thanks for getting in touch with us, @gdulin,
I want to make sure you're able to retrieve your data. I just need a few questions about the problem so I can provide the accurate resolution to this concern.
First, did you recently ordered or upgraded your QuickBooks Online account after a trial period? Secondly, what error comes up when you login to your account? Add the details or screenshots by clicking the Reply button below.
In the meantime, make sure you're logged in to the correct company file. If the file you're in has no data in it, click the Gear icon and check if there is a Switch account option.
However, if you're using a desktop product, follow the steps in these articles to help you retrieve the files:
I'll be on a lookout for your response. I want to make sure you're all set and I'm just a click away for help. Have a good one!