new to this! help?

I posted a photo yesterday of a pregnancy test with one dark line and one faint. I was encouraged it was positive and to take a digital test. Took one this afternoon and it said "No" I am due for my period on Sunday. Any suggestions on when I should take another test? New to this so not sure of best timing to do this- after missed period or differen time of day? Trying not to obsess over this- eek! Thanks in Advance!