Loosing clutch fluid
 

I put new MC, new ss slave lines, new slave on. Clutch feels really good, shifting is perfect, engages smoothly. I bled it a few days ago after I got it installed. I noticed my fluid level is slightly going down with time. I've checked for leaks and I can't find any. I remember a old mechanic once telling me that some air works itself out over time and for a few weeks you should keep a eye on it and top it off. I had this same thing happen in another car I owned and after a month it mainted clutch level for years no issues. Could it just be air working itself out like I suspect?