I was placed on Administrative leave

Hi, I’m a new cna and I’ve been working in the hospital for nearly 2months now and this is my 1st cna Job. This morning i received a call from the nursing director that they received a complaint against me. I wasnt able to clarify if thats from co worker or a patient. But looking back to how i worked the night before i received this letter I am confident that all of my patients didnt say anything to me or upfront that they didnt like me I was just shocked this morning that i received a letter. Im so confused demotivated and stressed. Does it mean im losing my job? Does it mean i have a bad record already. How long the investigation will take place