Here are common signs that may indicate ovulation, courtesy of the American Pregnancy Association:

• A change in cervical fluid appearance. During or just before ovulation, cervical fluid usually takes on the appearance of egg whites. But cervical fluid appearance varies from woman to woman.
• A spike in your basal body temperature -- your temperature at rest measured when you first get up in the morning -- can indicate that you have just ovulated. In most women, basal temperature goes down slightly just before ovulation. This is followed by a sharp rise in temperature, a sign that ovulation has just occurred.
• Cervical changes -- a woman may find that her cervix feels softer than usual, and may be in a higher position.
• Other symptoms -- deemed secondary because they may not happen as consistently or in as many women -- may include spotting, tenderness of the breasts, cramping, bloating, greater awareness of the senses, and a stronger sex drive.