So here are 3 kinds of safe and natural contraceptives you can use to detect ovulation:
1. Cervical secretion and position monitoring
Your vagina has mucous that changes in consistency and amount at different days of your menstrual cycle. To know when your ovulation is near, which is the most fertile set of days, look out for mucous discharge in your cervix that is very wet, slippery, clear and thick. It will be so to catch the sperms easily. At most other times, it will be creamy and sticky. Immediately after ovulation, there tends to be no mucous. During ovulation, your cervix will also be softer and higher than usual.
Also read:World Population Day 2017: Top 5 Myths About Birth Control
3. Basal body temperature method
Generally, your body temperature rises to half a degree immediately after the day of ovulation. To measure your body temperature, use a digital or contraceptive thermometer and measure your body temperature every morning. Do this before washing, eating or drinking and at the same time every day. If your body temperature for 3 days is higher than previous 6 by even a very small amount as .2 degree celsius, you are infertile for now. This method is 95% effective.
Related:World Population Day 2017: 4 Reasons Why Family Planning Is Important