It is difficult to see changes in your body as they happen very slowly (natural physique) and are not very dramatic usually. People who see you only on rare occaisions will notice the difference much easier.

That's not to say its not a good idea but checking every week or so will probably drive you nuts. It would be a much better idea to take pictures say front and rear double bi in shorts and then keep the pics in chronological order. This will show you total progression and you can compare before and after and differences in weeks, months etc.

P