I haven't been ovulating for 3months all of a sudden i feel ovulation symptoms, what could have possibly changed in my body?

Ovulation: It is not uncommon for a patient who does not ovulate regularly and may frequently skip several periods to spontaneously ovulate on her own without medication. Some patients with ovulation dysfunction have periods every 5 to 6 weeks, and some have periods only once or twice a year or even less frequently. The frequency of ovulation in a particular patient can also vary with weight gain or loss.