The carat (ct) is a unit of mass equal to 200 mg (0.2 g; 0.007055 oz) and is used for measuring gemstones and pearls. The current definition, sometimes known as the metric carat, was adopted in 1907 at the Fourth General Conference on Weights and Measures, and soon afterwards in many countries around the world.
Depending on your cycle length the most fertile days in the cycle varies: If you have 28 days between periods ovulation typically happens on day 14, and the most fertile days are days 12, 13, and 14. If you have longer cycles, say 35 days between periods, ovulation happens on day 21 and the most fertile days are days 19, 20, and 21.
1 21 day periods: If you have a shorter menstrual cycle, ovulation will occur on day 7 and your most fertile days are days 5, 6, and 7. 2  If your menstrual cycle is regular, but it does not fall within these periods, you can use an online fertility calculator to determine your fertility window.se the duration of your menstrual cycle to identify your most fertile time by subtracting 14 days from the total length of your menstrual cycle: 1  28 day periods: If your period typically lasts 28 days, ovulation will occur on day 14 of your cycle. 2  So your most fertile days will be days 12, 13, and 14.