You are already to late for emergency contraception, which must be used within 3 days.
Medical abortion can be done from about 3-6 weeks.
Surgical abortion from around 6-12 weeks, sometimes later, depending on laws in your state.
But the abortion forum might be more appropriate for this kind of post.
That aside, first be sure that you actually are pregnant to begin with. Then make sure that you actually want the abortion. There are resources available if you don't want it as well. Rash decisions made in a panic are rarely thought-through.