My brand new iPhone XS must have changed passcode

I recently purchased a brand new iPhone XS. I have always used the same type of passcode for my iphones. As of yesterday I had a glass tip over onto my phone. My ''protection glas'' cracked by the face-came but no damage to the phone whatsoever. However, after this incident, my phone says that I am putting in the wrong passcode, which is total ********. I've had the same 6-digit passcode for centuries. This all happened whilst my face-id did not seem to work after the incident. I have a new phone with lots of data that (i personally) have not backed up since its so new. How do I convince my phone that it certiantly is the right passcode, or if necessary force log-in somehow to from there on use faceid to change passcode????