Pregnancy test issue. Please help

Shoshanah
So it's about 3 days to my AF and I decided to take a pregnancy test this morning before work but the test had  
 bsolutely no results not even the test line after about 30 minutes  . When I got home about 12 hours later i looked at the test and it was positive!! Two lines and all !!! 
I'm soooo confused ! I don't know if I should take another one now even though it's late in the day or wait till tomorrow or a few more days . Help