In theory you're least fertile just before menstruation.
Take the average 28 day menstrual cycle:
A woman would ovulate around day 14 and produce fertile cervical mucus for up to a week beforehand, so the most fertile point would be between days 7-16 of the menstrual cycle. After ovulation there's no egg to fertilize, by the time you're due to menstruate any egg is long dead.
Unless you use Fertility Awareness Method you can't know when YOU are fertile or not, everyone has a different menstrual cycle and menstrual cycles can change all the time. You can't rely on an estimate or guessing fertile or infertile days based on previous cycles.
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The least fertile time in a woman's menstrual cycle is typically right after menstruation ends, and before ovulation occurs. This is because sperm can survive in the female reproductive tract for up to five days, while an egg is viable for about 12-24 hours after ovulation.
Going by a 28 day cycle (yours may be longer or shorter):
Day 1 = 1st day of your period Day 5 = last day your period Day 12-16 = This is when you are most likely to conceive if you have sex about this time Day 14 = Ovulation date (approximately) Day 15-28 = Most women ovulate between 12-14 days before their next period
So approximately between day 6 and day 11 of your cycle is when you would be least likely to conceive. However you would have to be very exact and know your own cycle very well before you would be able to rely on this method.
Good luck.
AnswerThe most fertile time during a Womans cycle is when she is ovulating. The least fertile time is during her period.Progesterone
Ovulation typically occurs around 14 days before your next expected period, so if you have a 28-day cycle, you may ovulate around day 14. However, the timing can vary from person to person, so tracking other signs of ovulation like basal body temperature or cervical mucus can help pinpoint the exact timing for you.
The citric acid cycle (also known as the Krebs cycle) produces the most NADH, generating 3 NADH molecules per cycle. The least ATP is produced in the electron transport chain, where each NADH molecule can produce up to 3 ATP through oxidative phosphorylation.
the Calvin cyclethe calvin cycle
Each turn of the Kreb's cycle must regenerate oxaloacetate.