Period lasting two weeks

Maricela • 25 years old. Married 💍. Mommy to a little girl and little boy.
I am taking vitex and this is my 5th month on it and this month it came on time but now it seems to be dragging on. After six days of regular period; I had very light spotting for 5 and now today it is more heavier with some cramping. Has anyone who has taken vitex had this happen? Any advice?? Thanks!