Are you a man or a woman?
A man is going to notice very little from 20mg of anavar per day. Men need to use 40-60mg per day.
As a female though, you should certainly be noticing something from 5 weeks of anavar at 20mg/day. How confident are you in your source? Anavar is one of the most commonly faked steroids.
I would head on over to our sister site evolutionary.org and check the source reviews section on the source you used. Your anavar might be fake.