Tranny Fluid Change

I have a 94 Accord EX (F22B1) Anyone have any ideas about this? One time I changed my engine oil and my automatic transmission fluid. When I was drivin that night after I changed the oil I noticed that my car was a lil louder. I think it was the transmission. I put the right amount of fluid. It started soundin normal like the next day. I am wondering was this a period where the tranny fluid has to work itself in or somethin like that? My tranny works great and shifts smoothly. its not a problem luckily. I am just curious about it. Thanks