Migraine instances in females

Hormonal changes in women
Fluctuations in estrogen, such as before or during menstrual periods, pregnancy and menopause, seem to trigger headaches in many women. Hormonal medications, such as oral contraceptives, also can worsen migraines. Some women, however, find that their migraines occur less often when taking these medications.

Hormonal changes can trigger a menstrual migraine headache, which can occur a few days before a period, and during the first 1 to 2 days.