What is the luteal phase of a period cycle?
The menstrual cycle is made up of several phases, each with a unique and essential role in preparing your body for possible conception.
While menstruation (the period) is the most well-known phase, the other phases are equally important for fertility and reproductive health. During the period cycle hormonal changes are responsible for regulating egg development and ovulation, as well as preparing the uterus for a fertilised egg.
Understanding each of these phases and how they support conception and early pregnancy is important to increase your chances of falling pregnant.
What is the luteal phase and when does it start?
The luteal phase is a key part of your period cycle which prepares your uterus for a possible pregnancy.
This phase begins right after ovulation and lasts until your next period begins – usually about 12 to 14 days. However, luteal phases that last between 10 and 17 days are also considered normal.
What happens during the luteal phase of a period cycle?
Significant hormonal changes take place during the luteal phase that prepare your body for pregnancy.
At ovulation, a dominant follicle ruptures from your ovary and releases an egg. After ovulation occurs, the ruptured follicle transforms into a structure called the corpus luteum, which produces high levels of progesterone and some oestrogen. During this time, the endometrium becomes rich with fluids and nutrients to support the implantation of a fertilised egg (embryo).
Oestrogen levels, which dip briefly after ovulation, gradually rise again alongside progesterone during this phase. This causes changes to breast tissue such as swelling and tenderness.
Meanwhile, levels of follicle-stimulating hormone (FSH) and luteinising hormone (LH) decrease during the luteal phase once ovulation occurs.
Symptoms of the luteal phase
You may notice some symptoms when you’re in the luteal phase, although not everyone will notice these changes.
One of the main symptoms is a slight increase in your basal body temperature. The increase may only be as much as 0.2̊ C, so you’ll only notice it if you are tracking your temperature.
Your cervical mucus will also change during the luteal phase. During ovulation, it becomes wet and slippery like egg whites. In the luteal phase, it becomes thicker.
During the luteal phase you may also notice PMS-like symptoms such as:
- breast tenderness
- fatigue
- mood changes
- bloating
- changes in appetite
- skin break outs.
Why the luteal phase matters for conception
The luteal phase is crucial for conception because this is when changing hormone levels create the optimal environment for an embryo to implant into your uterus, and for your uterus to support this early stage of pregnancy.
However, if the luteal phase is too short (less than 10 days) your uterine lining might not develop enough to support an embryo. Women with a short luteal phase can experience difficulties with conception or early miscarriage. This is sometimes called a luteal phase defect or luteal phase deficiency.
How to have a healthy luteal phase
Maintaining a healthy luteal phase involves following a healthy lifestyle that supports balanced hormone levels. This includes:
- managing stress
- maintaining a healthy diet rich in nutrients
- getting regular moderate exercise
- avoiding smoking
- avoiding alcohol.
If you have been diagnosed with luteal phase defect, there are treatments available. Your doctor or fertility specialist will work with you to determine the best option for you. This may involve hormonal medication or addressing underlying issues that may be contributing.
Understanding your luteal phase is important as it plays a crucial role in your fertility and ability to conceive. Variations in its timing or hormone levels can affect your chances of falling pregnant. We recommended you track your full period cycle, not just ovulation, so you have a clear picture of what happens in your body each month.
By staying attentive to your body’s signals and maintaining overall health, you can help foster a luteal phase that supports your reproductive goals and well-being.
Of course, if you experience irregularities or have concerns about your luteal phase or fertility, a fertility specialist can provide personalised guidance and treatment. Contact us below if you would like to make an appointment.