The stage after ovulation is called the luteal phase. It begins the moment your ovary releases an egg and lasts until your next period starts, typically spanning about 14 days. During this phase, your body shifts into preparation mode, building up the uterine lining in case a fertilized egg needs a place to implant.
What Happens Inside Your Body
Once the egg leaves the ovary, the empty follicle it came from doesn’t just disappear. It transforms into a temporary hormone-producing structure called the corpus luteum. This structure pumps out progesterone (along with some estrogen), and progesterone is the dominant hormone of the luteal phase. Its main job is thickening your uterine lining with blood vessels and nutrients, creating the ideal environment for a potential pregnancy.
Your basal body temperature also rises slightly after ovulation, typically by 0.4 to 1.0°F (0.22 to 0.56°C). This small but consistent shift is one of the clearest signs that ovulation has already occurred and the luteal phase has begun. If you’re tracking your cycle with a thermometer, you’ll notice your temperature stays elevated throughout this entire phase.
Cervical Mucus Changes
Around ovulation, cervical mucus is slippery and stretchy, similar to raw egg whites. Once the luteal phase begins, rising progesterone causes it to dry up quickly. For the remainder of the phase, mucus is thick, sticky, or nearly absent. This shift happens because the fertile window has closed, and the body no longer needs to help sperm travel toward the egg.
The Implantation Window
If the egg was fertilized, it doesn’t attach to the uterine lining right away. It spends roughly six to seven days traveling down the fallopian tube and dividing into a cluster of about 100 cells called a blastocyst. Around six days after fertilization, the blastocyst burrows into the thickened uterine lining in a process called implantation. Some people notice light spotting or mild cramping around this time, though many feel nothing at all.
Once implantation occurs, the embryo sends a hormonal signal that keeps the corpus luteum alive and producing progesterone. This sustained progesterone is what maintains the pregnancy in its earliest weeks.
What Happens If You Don’t Conceive
Without implantation, the corpus luteum has a built-in expiration date. It degenerates after about 14 days, and progesterone and estrogen levels drop sharply. That hormone withdrawal is the direct trigger for your period. The thickened uterine lining, no longer supported by progesterone, breaks down and sheds. A new menstrual cycle begins.
Common Symptoms During the Luteal Phase
The hormonal shifts of this phase are responsible for what most people recognize as PMS. Symptoms tend to appear in the second half of the luteal phase, once progesterone peaks and then starts to fall. Physical signs include breast tenderness, bloating, food cravings, headaches, constipation, and trouble sleeping. On the emotional side, mood swings, irritability, fatigue, and anxiety are all common.
Not everyone experiences these symptoms with the same intensity, and they can vary from cycle to cycle. They resolve once your period starts and hormone levels reset. If your luteal phase is consistently shorter than 10 days, it can sometimes indicate that progesterone levels aren’t rising enough to support the uterine lining properly, which is worth discussing with a healthcare provider if you’re trying to conceive.