Every woman’s body is different. However, most women do find experience some changes on their menstrual cycle also known as menstruation. It is concerning to see so many other HCG sites out there that say that the HCG diet will not affect your HCG cycle at all. That must simply be lack of experience. We see changes of all types: starting earlier, starting later, having a cycle for the first time in a few years, having break through bleeding even when FAR into menopause. Be aware that it does commonly cause some kind of change to your menstrual cycle. Regarding whether or not to take the drops during your cycle, it is up to you. We have had customers report that some do and some don't and have not found any issue either way. What we recommend is that you not take the drops on your 'heavy days' as they tend to make those days "heavier".