Hi there, most pregnancy test kits out there are accurate on the day your period is due. If I dont't remember wrongly, Clearblue has a pregnancy test kit that is accurate 1 week from your ovulation, probably the digital one, I'm not too sure.
I'll advise you to just be patient and wait a week more before you test. I once tested negative on the 3rd day I missed my period, but positive a week later.
My advice is to use the morning pee to test as it contains the highest level of hcg.