Your levels of progesterone and estrogen are off-balance
The gynecologist says: Spotting can be a sign that hormone levels are off, but in most cases. It is normal for a small amount of spotting around ovulation two weeks before a period is due related to hormone changes. Women who find spotting to be a nuisance can talk to their doctor about options. The most common option is to try a birth control pill, which is progestin-dominant and will help stabilize the lining. Numerous studies have looked at supplements that can help control [hormone-related] spotting. Unfortunately, while small studies show promise, most large scale studies do not show benefit for vitamin B supplementation, vitamin C or iron.”(Related: Are Your Hormones Out of Control? Heres How to Deal)
