What does it mean when the positive line shows up but doesn't get darker in color until right before ten minutes and gets really dark after the ten min?

You're pregnant?: I assume you're talking about a pregnancy test. Positive is positive. It's an immuno-chemical test. The antibody binding with the HCG molecule is very specific. If it's reactive, you can be pretty sure. As far as when the stripe gets dark... Just how many times did you repeat the test? Don't worry about the specific response. Again, positive is positive.