Pregnancy test after scheduled period.

Has anyone ever tested the day of your scheduled period only to get a BFN but test days later and get a BFP? I'm a week late tested on the day on my missed period, BFN. I haven't tested again because I don't want the disappointment of a BFN. I've never had a cycle longer than 31 days & I'm at 37 days now. 
Wanted to see if anyone's gotten a BFP under the same/similar circumstances.