Please choose the correct ending to complete the given sentence: Health: [header] How to know when you are ovulating [title] Buy a basal body temperature thermometer. [step] Your basal body temperature is your lowest body temperature over a 24-hour period. In order to regularly take and monitor your basal body temperature (bbt), you'll need a basal body temperature thermometer.

Ending1: [substeps] Basal body thermometers are available in most drugstores and come with a chart to help you track your bbt over several months. [title] Take and record your basal body temperature every day for several months. Ending2: [substeps] A basal body temperature thermometer measures the temperature that you're nearing, which is typically around 150º f (38 ºc). It's likely to be lower than an bbt temperature. Ending3: These thermometers will provide a steady reading for your temperature if you're ovulating a fetus. [substeps] If you're 2-4 months pregnant, your bbt temperature usually indicates that you are ovulating. Ending4: These thermometers should be used anywhere from nine to 24 hours after ovulation. If you're uncomfortable using a basal body temperature thermometer, try using one of these thermometers : [substeps] Digital body thermometer degrees d [title] Take a cystine scale.

Answer format: ending1/ending2/ending3/ending4