Vitex and PCOS, anyone?

Tiffany
I was diagnosed with PCOS at 18. My husband and I have been TTC for 10 months now (I'm 26).
I have NEVER had normal periods. Not since I got my first at age 14. 
In the past 10 months, I have gotten AF 3 times. I am currently taking the following:
Metformin
Prenatals
Vitamin D
Omega 3-6-9
Pregnitude
I have to say, I LOVE pregnitude. All of my periods have come since I started it and it has helped to level out some of my symptoms. But my periods are still months apart. I have been reading LOADS about Vitex online and a local nutritionist recommended it. So I picked some up. They suggested the concentrated stuff to ensure the correct dosage. I started it Thursday. 
400mg Thursday before bed
800mg Friday (400 morning/400 evening)
I woke up this morning and AF has arrived!!
Is it too soon to have this effect and just a coincidence? 
Please, anyone have success with Vitex?