First half of menstrual cycle is controlled by progesterone while second half of it is controlled by estrogens.

Answer

### Step-by-Step Solution:

1. **Understanding the Menstrual Cycle**: The menstrual cycle typically lasts about 28 days and is divided into two main phases: the follicular phase and the luteal phase.

2. **Follicular Phase (Days 1-14)**: The first half of the menstrual cycle is known as the follicular phase. During this phase, the primary hormone involved is estrogen, which is produced by the developing follicles in the ovaries. Follicle Stimulating Hormone (FSH) plays a crucial role in stimulating the growth of these follicles.

3. **Ovulation (Around Day 14)**: Around the 14th day of the cycle, ovulation occurs. This is when a mature ovum is released from the ovary. The surge in Luteinizing Hormone (LH) triggers this process, and estrogen levels peak just before ovulation.

4. **Luteal Phase (Days 15-28)**: After ovulation, the cycle enters the luteal phase. The ruptured follicle transforms into the corpus luteum, which produces progesterone. Progesterone is essential for preparing the uterine lining for potential implantation of a fertilized egg.

5. **Role of Progesterone**: If fertilization occurs, progesterone levels remain high to support the early stages of pregnancy. If fertilization does not occur, progesterone levels drop, leading to the degradation of the uterine lining and the onset of menstruation.

6. **Conclusion**: The statement in the question is incorrect. The first half of the menstrual cycle is controlled by estrogen (not progesterone), while the second half is controlled by progesterone.