Hi A. :-)
I'm not certain about these tests, so can't give any accurate answers. You are on the pill, so those hormones may be affecting the test. But what I do trust is intuition.. so if you think you "know" you are pregnant.. and you are timing it as 5 - 6 weeks... you will have to wait a few more weeks no matter what according to your doctor's policy. So:
You can wait another week to test again, fresh morning urine, and/or you can assume you are pregnant and the glory of knowing so early helps you to prepare your body to be as safe a vessel as possible for this new life!
So that means taking proper care of yourself, eating well, resting well, eliminating stress as much as you can.. the brain of your baby is beginning to form now so go into the JOY as much as you can! Moms usually go through a "nesting period" before the baby is born, doing preparations.. but you have this chance now!
Nest your uterus well so that the best possible outcomes are there for your new baby. Knowing this early in the game is such a plus for the best outcome for all!
hugs,
A. R.N., Energy Medicine Practitioner