Ovulation typically occurs 10 to 14 days before the start of your next period. If you have had your period, it means that ovulation has occurred. It is not necessary to perform ovulation tests every day, especially considering their cost. Basal temperature should be measured with a basal thermometer, which is more sensitive than a regular thermometer. Each person's temperature may vary slightly, so it is important to measure it at the same time each morning, before getting out of bed. If you have any other questions, feel free to ask.