He pre d inside me although i took ipill can i still get pregnant?

my last period was on 17 dec and it got over on 20 dec i had with my boy friend on 26th dec... bec it just happened we had no protection although he didnot come inside me but he pre d inside me.... i took an ipill after 2 hours....can i still get pregnant i am very scared....i am only 21 and i dont want to get pregnant.... and if i am pregnant how will i come to know and how can i get the baby aborted without surgery....please help.......thank you