How quick will you see a black line on a pregnancy test when you are pregnant?

I believe it depends on how far along you are. The farther along the faster you see the line. Past experience with my youngest daughters 8 test (yes 8...I didn't want to believe it) and oldest daughters that how it worked. My oldest daughter was only a few weeks and it took awhile to see a line. However my youngest was farther along when she took the tests and it popped up immediately. Read the instructions in the pack.