I'm confused. So the doctor did a urine test and says you're pregnant? So the urine pregnany test at the doctor is similar to the at home ones. It tests for the pregnancy hormone, which usually begins to release in your body 2 weeks after the sexual encounter. It takes about 2 weeks from the time of the intercourse to the time of implantation. At 4 weeks, implantation should have already occured. Did your doctor check for ectopic pregnancy?
You cannot get rid of a pregnancy without an abortion. Sure, you could do all sorts of crazy things but there's no gaurantee you're not going to be injured or killed by it, and there's no chance it's going to kill the embryo. Therefore, you could end up with a baby with all sorts of issues due to your failed attempts. If you don't want to be pregnant, get an abortion. Otherwise, consider carrying the baby and giving it up for adoption.