It's still very early and you're unlikely to have pregnancy symptoms yet-although you may have some light spotting (see You are 3 Weeks and 5 Days). Some women claim to "feel" pregnant, even before changes to their breasts are noticeable or before they start feeling sick. Some women say that they just "know." You may be very in tune with your body and may notice that your body is changing even before you are able to take a test. Unfortunately, sometimes our minds can play tricks on us: you may want to be pregnant so much that you can sometimes convince yourself that you're feeling different. If you don't feel any different, don't worry, this is also completely normal.
Either way the only definitive way to know whether or not you are pregnant is to take a pregnancy test (see How to use a home pregnancy test). You don't need to go to your doctor to confirm your pregnancy since the tests that they use are the same as those bought over the counter. If the test is positive, you're pregnant!