A new device detects changes that occur before ovulation and sends an alert to your mobile phone.

The ring is self-inserted into the vagina from where core body temperature measurements are sent wirelessly to a paired smartphone.
In women, ovulation causes an increase of one-half to one degree Fahrenheit in basal body temperature (BBT). Monitoring of BBTs is one way of estimating the day of ovulation.
Tracking ovulation through fertility awareness procedures is the best way to identify the appropriate time to get pregnant.
The accompanying app is used to precisely track temperature trends that are correlated to when women are most fertile.
There’s no need to manually record readings and having the device inside during sleep can provide coverage that would be difficult to obtain otherwise.
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Source-Medindia