Vitex (chaste tree) helps the body to build its own progesterone. This is better than the pharmaceuticals, because vitex will not overload the body. The body will produce only what it needs.
The problem is that it can take months for the vitex to build up. Not an overnight fix. Sorry. I'm just saying that you should not give up, if you don't see results even after a week.
Here is something to try. Jiaogulan. You can find it inexpensive at many online supplement vendors.
Jiaogulan also serves as an adaptogen
...meaning that it works to correct imbalances in the body, whether they are excesses or deficiencies. Jiaogulan has balancing effects on the digestive system, blood pressure, the reproductive system, the immune system, mental functions, and more. For the digestive system, jiaogulan helps by increasing the nutrients your body absorbs from the food you eat. At the same time, jiaogulan helps to regulate high cholesterol, making it a helpful aid if you are working on losing weight. Jiaogulan works as an adaptogen on your hormones by either stimulating or calming your system, depending upon your need at any given time. By regulating hormonal functions in both men and women, jiaogulan actively supports your body's ability to cope with the many stresses that are part of our day-to-day lives.
Though this may all sound too good to be true, these claims are based on research. In brief, the science behind jiaogulan shows that it contains a large quantity of gypenosides, which are very similar in structure to the panaxosides (also known as ginsenosides) found in ginseng. There are three to four times as many gypenosides in jiaogulan as there are in ginseng. Research suggests that the fact that jiaogulan has many more gypenosides may be why it is such a powerful adaptogen.