With the Changeases formula, I always told my ladies to NOT start taking it when they are pregnant. If you are already taking it when you get pregnant to regulate the hormones, then you need to keep taking it through the pregnancy so that you don't throw your body out of balance by removing something it has come to depend on. However, it is not a good idea to start taking it after you become pregnant.
The 6-week formula you are referring to for the end of your pregnancy is definately something I recommend. It is made up of herbs that the Indian women used to use to help prepare their bodies for labor and I have had alot of women tell me it made a huge difference in how their labors went.
I am leaving next week for Ohio to start putting the 'kit' together.