Let's talk about one of the topics I'm very excited about: our menstrual cycle. Today, we're going to class.

1st menstrual cycle—it's called a cycle because it starts at a point and comes to an end at the same point.

The normal number of days it takes every woman to go around this circle is usually 25 to 35 days.

So it's very personal. Then the average, or the very common number, is 28. With your 28-day cycle, day number one to five, you're menstruating. If your regular menses are five days, some three days, some two days, some five days, some four days. It's also very personal. If you've always been menstruating for two days since you started menstruating, that is your usual menstrual party.

So there is nothing wrong with you. You're taking a 28-day cycle.

Day 14 is usually the day that you're related; that is the day that you are most fertile.

But on days around day 14, you can also get pregnant if you have unprotected sex on day 12.

Day 13, and day 14 can also be very fertile. This is because the male sperm has been known to have a lifespan of three to five days. Have sex on day 12, but then the sperm can live three or five days. So you can see that as on day 14 when you, the lady, will release your egg, the sperm will still be alive, and it can mix with the egg, and you can still get pregnant, and the egg that the lady releases can also live for sometimes 24 to 48 hours. So a day or two after day 14 can also be very fatal. Any other day aside from these days, a lady is known to be in her free.

These things are controlled by hormones and sometimes even the change in your diet, and your weight. So many factors can affect the hormonal balance and may affect your ovulation, your menstruation, and all of that. And your free, may not be free. So be safe out there and always use protection or abstain.