I know ept is not as sensitive as most test. try using a first response as they are made for early detection. I heard from friends of mjne that the answer pregnancy test is also sensitive. I bet your preggy and im guessing the reason for the negatice is a difference in sensitivity in test because you may not be very far along. Good luck! Take a test next week I bet it's positive.
If you feel like you are pregnant take another one in a few days! I got a faint positive EPT too, but took a digital and it said pregnant. So idk