No, there's no way you can find out this early on whether or not you are pregnant. If you take a test now it will give you a negative, no matter whether or not you are pregnant. At the moment (assuming you have regular cycles) you will have only just ovulated, meaning there won't be enough hormone in your pee for a test to show positive, even if you are pregnant.
You can get a First Response pregnancy test which can be done up to 4 days before your period is due, but it's not as reliable as waiting until the actual day (or even a day or two later) and taking a test then.
With the first response tests, the problem is that you could get a false negative, and that wouldn't be good. If you really want an accurate result, test on the day your period is due.
However, as you say you had sex a week ago, and your period is now due in another 2 weeks, thankfully there is a good chance that you won't be pregnant. This, of course, is assuming that you have regular cycles. Because your egg will only be released around now, so a week ago you won't have been fertile.
Having said that, I don't know how regular your cycles are, and the body doesn't exactly work like clockwork, so yes there's still always a chance you could be pregnant.
Just wait the two weeks and take a test.