Fertility monitors are designed to help couples know what the best times of their cycle would be to conceive a pregnancy. These monitors help people who have been trying to conceive previously but have been unable to do so. The monitors help to narrow down the few days of the month that are optimum for conception.
In conception, the female body releases an egg or ovum once a month. The ovum then has a short window of time that it can be fertilized by the male sperm and implanted into the uterus to grow into an embryo. The male sperm is only viable for 48 hours once it has entered the female body so timing can be a tricky thing for some couples if they are not sure when their fertile times are.
These fertility monitors remove the need for guess work and what ifs.