In an RFE, they ask you to send a document which they feel you should have sent in the first place, or which they feel they need to see just to verify any kind of doubt they may have.
Generally, an RFE may ask for your latest paystubs, or copies of your passport, or similar things. If you can provide whatever they ask for, then all is fine. Then, all the harm an RFE will do is delay your approval, nothing worse than that.
Next week you will see the RFE yourself, and then you may know if you need to worry or not.