I'd wait until the day your period is due, and then if it still hasn't shown up in a couple weeks, test again.
Please don't be disappointed if it is negative - I mean that's easy to say, you probably will, but it's totally normal. Isn't this your first month of trying? I think they say on average it takes 6 months to get pregnant. It took DH and I 5 months, and I had 3 months of tears because I wanted to get pregnant. Finally, in the 4th and 5th months, DH and I used those ovulation kits, so if you get really frustrated, there is that option.
May God bless you!
Chrissy