Every woman’s body is different. However, most women experience some changes in 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. We see changes of all types: starting earlier, starting later, having a cycle for the first time in a few years, and having breakthrough bleeding even when FAR into menopause. Be aware that it does commonly cause some changes to your menstrual cycle. It is up to you whether or not to take the drops during your cycle. We have had customers report that some do and some don't and have not found any issue. We recommend you not take the drops on your 'heavy days' as they tend to make those days "heavier."