You can't distinguish an ectopic pregnancy from a healthy pregnancy with a urine test. The test is usually positive with both although ectopic pregnancy is generally associated with more slowly rising HCG. If you have excessive pain on one side that concerns you, the doctor can check with an ultrasound. If you're worried, it's better not to wait because later diagnosis can lead to surgery and serious complications such as tubal rupture. Caught early, it can sometimes be chemically terminated.
A ectopic pregnancy will show up on a ultrasound. The signs are usually bad pain in the fallopian tubes and bleeding. If u suspect a ectopic pregnancy you need to go hospital otherwise it could get a whole lot complicated. I think on blood work and urine it shows up as a normal pregnancy, until the symptoms start showing otherwise