Are there any safe natural home remedies that will help terminate a pregnancy? i'm about 4 weeks along.

No: Fortunately, America is beyond that (that was before modern medicine and before getting rid of laws against inducing miscarriage). Any woman who needs to induce a miscarriage (easier to say abortion), such as if her early fetus has a genetic defect or other significant birth defect, can get help from her Ob-Gyn doctor. The doctor has good reliable ways to do this ("natural" is not in the picture).