I just took an HPT today but came back negative. I'm going to give myself a few more days and if I don't get my period then I will try again. This time I'll take another HPT right when I wake up in the am.
I would say take one and good luck. Even though everyone is different i took my pregnancy test the day i was due for my period and it came up positive fast! If yours comes up negative then wait a week and take one again if your period hasn't arrived.
Get First Response and take it in the morning! Good luck!