During which cycle days does the proliferative stage occur?

• A. Cycle day 7-14
• B. Cycle day 14-28
• C. Cycle day 1-6
• D. Cycle day 1-14

Answer: (A)

The proliferative phase is when the endometrium rebuilds and thickens in response to rising estrogen from the developing follicles. This estrogen-driven growth occurs during the latter part of the follicular (ovarian) cycle, roughly from day 7 up to ovulation around day 14. After ovulation, the endometrium shifts into the secretory phase under progesterone.

So, the best fit is days 7 to 14 because it represents the period of estrogen-dominated endometrial rebuilding that leads to ovulation. Day ranges can vary among individuals, but this mid-cycle window aligns with the endometrium preparing for a potential implantation prior to ovulation.