I have read from many online sources that you can expect to have ovulated from between 10-16 days before your next period starts. Since you can only get pregnant within a small window of time after ovulation (between 12-36 hours) this question is all dependent on how long your cycle is, how regular you are etc. If you have the standard 28 day cycle, you could ovulate anywhere between cycle days 12-18 (if my math is correct) but this could vary greatly if your cycle is longer. Basically subtract 16 days from your standard cycle length to get the soonest you could have ovulated and 10 days to get the latest you could have ovulated.
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On day 10 or 11 usually
Normally you get your period 14 days after you ovulate, so ovulation takes place around day 26 of a 40 day cycle. 14 days is the average and it could range from 12-16 days.
You don't ovulate on the last day or the day after the last day of your menstrual cycle.The last day of your menstrual cycle is the day before your period - the first day of your period is day one of your menstrual cycle. Ovulation occurs two weeks before menstruation, if you had a 28 day cycle that would mean you would ovulate around day 14 of your menstrual cycle.Unless you use fertility awareness method you can't tell when you are fertile or ovulating.
No. Many women monitor their menstrual cycles with basal body temperature (BBT) charts to find out when they ovulate. This involves taking your temperature when you awake each morning, before you get out of bed, while your temperature is at its lowest for the day. When you ovulate, your basal body temperature typically rises about half a degree Fahrenheit. In other words, ovulation might affect your body temperature, however your menstrual cycle wouldn't. I hope this answer helps you.
maybe your pregnant, maybe your period cycle is changing