###Human: Can Unwanted 72 cause early and abnormal periods? ###Assistant: Hi. Unwanted 72 is a high dose of progesterone hormone, which is the same hormone produced in the body in the second half of period after ovulation. This pill will suddenly increase the thickness of the inner lining of the uterus, making it unfavorable for a possible pregnancy to implant. Hope I have clarified your query, do write back. For further queries consult an obstetrician and gynaecologist online -->