I had a small dot where the positive line would be on the pregnancy test. what does this mean?

It means you should get another test to get more consistent results. If the line did not fill out it likely means the test itself was not produced up to acceptable standards and calling it positive or negative would not be reliable.

If you had sex since your last period and missed your period by 4-5 days, repeat the test with a different kit and follow the instructions carefully. Alternatively, you could get a blood test for HCG level to settle the issue.