You can not trick your body into producing HCG which is the pregnancy hormone that is detected on a HPT.
I am a little confused - were you trying to get pregnant or is this something unexpected and unwanted?
Please make an appointment with your doctor and discuss all your concerns/fears with them.
If you had a positive on a pregnancy test then chances are you are pregnant. They rarely produce false positives. The morning after pill only works within a very short time frame from having intercourse, so at this point it would not prevent the pregnancy from continuing, but could do harm to the developing fetus. I agree with Spade. You need to see a Dr. to confirm if you are pregnant, and to discuss your options if you are.