Self abortion: Two words: Dumb idea. If you're early enough in the pregnancy to carry it off with relatively low-risk abortion teas, you're still likely subjecting yourself to the risk for no reason, since you're at the stage where miscarriages are common anyway. If you weren't already in the process of having a miscarriage, taking enough of the stuff to kill the baby can kill you as well. Or you might have an undiagnosed ectopic pregnancy, and your attempts to do an abortion will delay diagnosis and appropriate care. If you're considering sticking things in your uterus, I'd give you the same two words -- Dumb idea -- but in italics, boldface, and underlined. You can poke a hole in your uterus or give yourself a nasty infection. And there is no such thing as a "natural" abortion. By definition you're doing something to thwart Mother Nature if you're trying to dislodge a fetus or embryo that your body is trying to hold on to. So go to a doctor and get some proper prenatal care.
Laws about abortion in the third trimester: Summed up here, with links to more information.