My period ended on the 17th. I had unprotected sex on the 19th. On the 20th I took the plan "b" pills. Now on the 25th I am not sure if it is bleeding or spotting. It is dark colored but there is more than just a few drops. Is there anything wrong with me? Is there a possibility that I am Pregnant?

Most likely it is just an effect of the "morning after pill" which will for several months have effects on your cycle and period.

With that said, of course as you know the "morning after pill" is not 100 percent effective, so of course you could be pregnant.