Hi. My First Day Of Menstration Last Month Is Aug.

Hi. My first day of menstration last month is Aug. 17 2015. And lasted for only 3-4 days. And last september 3 . We had unprotected sex and a few days after that i had spottings lasted for 3 days. . And probably my menstration should came last sept 17. But until now september 26 it didnt came maybe im 3week pregnant i tried pregancy test and i has 1 line and the other is fainted. What is the easiest way to terminate my pregnancy? Should the herbal abortion will be successful in this early age of pregnancy?