1. If you have consequences from your drinking and continue to drink, that might be a sign to get evaluated.
2. If you can't stop drinking once you start.
3. If you are preoccupied with drinking.
There are others, but from what you've shared with us, I wouldn't be worried. I'm not a medical professional, but I have my own struggles with alcohol and have asked this question before, so I know some of the differences between regular drinking and unhealthy drinking from research online.