Af still hasn't showed

Me
She was due to show on Tuesday and I'm glad she hasn't. I tested Sunday, I barely saw anything so it probably was a bfn. I'm trying not to get my hopes up, hubby told me to try not thinking about it. 
I was just wondering when should I test again if af doesn't show at all. 
I haven't had any pms symptoms at all, I haven't noticed any changes eitherz