Generally, in the US, abortion is an option from very early pregnancy (somewhere between 4-6 weeks, depending on where you go) until about 24 weeks. Abortions are available later than 24 weeks only in rare cases for medical reasons. However, the earliest and latest into your pregnancy you can get an abortion depends on the laws in your state and what doctor, clinic, or Planned Parenthood health center you go to. In certain areas, it can be hard to find a health care provider who will do an abortion after the 12th week of pregnancy.
In general, the abortion pill is available until the 10th week of pregnancy. The staff at your nearest Planned Parenthood health center can go over all your options with you.