No, but small messages would be bigger. I just did an example, I encrypted "This is Fran. How are you doing?" (My name isn't Fran.) It was 368 bytes, far larger than the original text of 34 bytes.

I then encrypted the entire message you replied to and it was only 623 bytes. The original was 449 bytes.

Also, you can further obfuscate it by playing with the compression levels and algorithms.

The point being, the difference of 255 bytes is hardly enough to draw attention and hardly enough to hit data caps or affect battery life.