Preparing to get pregnant by measuring basal body temperature will only tell you that you’ve ovulated after your ovary has released an egg, and since eggs only live for 12-24 hours, it may be too late to start trying that month. There are only a few days in each menstrual cycle when you can get pregnant, which is why it’s important to know which are your most fertile days. An ovulation test can accurately tell you when you are most likely to conceive if you have intercourse and can help you get pregnant faster. Ovulation tests work by identifying the rise in hormones that surge just before you release an egg, so you know when you can have intercourse to have the highest chances of getting pregnant.