A reliable Ovulation Calculator - Pregnancy Calendar app, even when you have irregular periods. ▌Fertile Days and Period Tracker ● Calendar can help determine your most fertile days and when you're likely to ovulate so you know when to try for a baby. ● Determine your most fertile days and increase your chance of conceiving. When did your last period begin? ● Monthly calendar tells you your daily chance of getting pregnant and your peak fertility days ▌Pregnancy Mode ● Week by week Pregnancy