It is very common to have a persistent high after ovulation, which usually occurs between the 14th and 20th days of a woman's menstrual cycle. This phenomenon is called a rise in body temperature, and is the body's response to preparing the fertilized egg for implantation. However, if a woman continues to have a high body temperature after ovulation and it persists for weeks or months, she may need to talk to her doctor right away.

Some possible reasons why a woman may have a persistently high body temperature after ovulation include:

1. Illness: Certain illnesses, such as thyroid problems and anemia, can cause a woman's body temperature to rise during her cycle. If a woman continues to have a high body temperature for several weeks after her cycle ends and it doesn't improve, she may need to talk to her doctor right away.

2. Pregnancy: If a woman continues to have a high body temperature for several weeks after her cycle ends, and this persists for weeks or months, she may be pregnant. In this case, she needs to consult a doctor immediately and undergo further examination and treatment.

3. Medications: Certain medications, such as antibiotics and antidepressants, can cause a woman's body temperature to rise during her cycle. If a woman continues to have a high body temperature for several weeks after her cycle ends and it doesn't improve, she may need to talk to her doctor right away.

4. Other factors: Other factors, such as psychological stress and physical health conditions, may also cause a woman's body temperature to rise during her cycle. If a woman continues to have a high body temperature for several weeks after her cycle ends and it doesn't improve, she may need to talk to her doctor right away.

In summary, it's common for a woman to have a persistently high body temperature after ovulation, but if it persists for weeks or months, she may need to consult a doctor immediately.