it actually sounds like you are pregnant! are you sure the period wasn't actually implantation bleeding?? because implantation bleeding is brown, what i would do is wait a little bit more and take the test again because it tests the HCG in your urine, and it takes awhile for it to build in your system. If it turns out that you aren't pregnant, try again! but this time, do it when you are ovulating, and in a position that directly hits the cervix.
Goodluck and God bless!
Melanie