This is a bit of a no brainer isn't it. Stop taking the diet pills, do a test. If you are pregnant see your doctor, if not carry on taking the pills if you feel you really need to. Why are you afraid to see a doctor? Are your pills illegal? What is a couple of pounds of fat against a baby unless you are more interested in your figure than a child in which case, if the test is positive, you should arrange an abortion and go back to your first love, pills.