3 weeks pregnant I think?

If you are 3 weeks pregnant, then your implantation has barely occurred, meaning that any HPT will come back negative. It takes 4 weeks for the tests to really be accurate. Also, any pregnancy test is invalid after so many minutes (as listed on the box). The reason for this is that after so much time, the chemicals disintegrate and you are left with a false positive. Almost always, even for a person who isn't pregnant, a test will become positive if left. I would throw those out, as they serve no purpose. If you are really unsure and you want to know before you get the bloodwork, try a digital test. When doing that, make sure it's an early read one and that you follow the directions. Follow up with making a doctor's appointment for blood work to see if you are pregnant.