Ovulation usually happens about halfway through your menstrual cycle. This is about 14 days before the first day of your next period in a typical 28-day cycle, but the exact time can vary. Signs that you are about to ovulate can be subtle. However, there are some things you can pay attention to and track over time to help you predict your fertile window. Changes in mucus Around the time of ovulation, you may notice your vaginal discharge is clear, stretchy and slippery — similar to egg whites. After ovulation, when the chances of becoming pregnant drop, vaginal discharge tends to become cloudy and thick, or disappear entirely. Changes in body temperature When you’ve just ovulated, your body temperature may increase very slightly, by about half a degree Celsius. If you’re using temperature to keep track of when you are most fertile, you need to use a special thermometer to take your temperature every morning before you get out of bed. If you record the readings every day using a graph or a spreadsheet, it’s possible to learn your pattern over time. The time when you are most fertile is 2 to 3 days before the rise in temperature. Other signs There may be other signs that you are near the time of ovulation, such as mild abdominal cramps, breast tenderness or increased sex drive. However, using these signs to predict when you’re fertile is not the most reliable method.