Curious

Does a cheap dollar store test read a lower hcg then a clear blue digital does? I have the New clear blue that tells many weeks. I have a 32 day cycle. Except my af never came since Jan 18 I am on cd52 now and have had 3 bfn's. I'm trying to wait it out til friday because I dint want to waste the last digital I have. Would,I be better off getting a cheaply test?