Took a test 2 days before my period negative

Im supposed to have AF today and so far nothing. Going to see how tomorrow goes..my fertile days were the 29 of june - july 4th and had sex on june 27 and 28th aso on jul 2 - the 5th. Which were my fertile days. Of course had sex on the 9th 11 and 13 of july. Period was due today and according to ONE of my 3 pregnancy apps im supposed to take a test today but i dont want to rush into buying it since i took it two days prior and it was negative.. thoughts?