There are many ways you can estimate when you’re ovulating.
One of the most ‘natural’ ways is by recording your basal body temperature.
Another way to calculate ovulation is to use a mobile app that takes into account the length of your cycle.
You can also get an ovulation kit from a pharmacy.
In addition to the above, you can observe the changes in your cervical mucus.
Finally, some women may see a bit of blood (which is perfectly normal) or feel some slight pain in the lower abdomen near the day of ovulation.
If you want to know more information, read this